This is not to be a hard fast rule for preparing to do Hardmodes but should give what I think is a general idea of what is needed. Sometimes all that is needed is another body so the instance can stay open.
First and foremost in Hardmode is the need to listen to the lead and those more knowledgeable of the content being handled. The content is designed for players to fulfill certain roles. You run off and do your own thing you put the team and yourself at risk of failure.
Roles and suggested preparation
*Note below is listed various "Bonus" many of these bonuses only provide small improvements.
General Preperation
Armor - Full Crafted Suit Krayt/Rancor/Dragonet Health Boost Armor with 35's and Exotics Attachments
Weapon - Crafted Weapon with Exotics Attachments
Clothing - Shirt, Bandolier, Cloak, Backpack, and Belt respectively with 35's and Exotic Attachments
Buffs - Buff Bot (Doctor/Squad Leader), Flag Buffs (Faction Flag), Inspiration Buff (Entertainer, recommend 3k+ Energy/Kinetic), Lasting Performance (Entertainer), Off the Books / Junk Dealer Buff (Smuggler), Familiar (Daily Token Vendor), Mustafar Injector (Sickness of the Storm Lord) / Stim, Tactical Stim (Squad Leader), Favor of the Elder (Profession Badges), Power Ups (Reverse Engineer Crafted for Shirt/Chest/Weapon), Food and Drink (Chef Crafted), Bantha Surprise (You will want more health).
Bonus Buffs - Event Food and Drink, Large Aurilian Crystal, Innoculation World Boss, Warzone Stim (Yes the reactive heal stacks), Biological Focus Crystal (Rare Loot Chest), Synapse Focus Crystal (Rare Loot Chest), GCW Base Buffs, Bounty System Enabled (Opt into being Bounty Hunted, the reactive heal stacks).
Bonus Stat Boost (OG Heroics, and Kashyyyk Daily/Hardmode) - 10 Parry Reduction (Axkva Min), 10 Critical Hit Reduction (Tusken King), 10 Strikethrough Chance (IG-88), 10 Block Reduction (Imperial Star Destroyer), 10 Evasion Chance (Exar Kun), 60 Constitution (Clone of Tank), 200 Block Value (Undead Overlord), 6 Critical Chance (Blackscale Watch Commander), 60 Stamina (Hracca Glade General)
Tank Role: You get aggro onto you so those dealing DPS can stay alive.
Expertise - You will need Instigate and Area Instigate if your are Normal Class, if Jedi you will need Enrage and Area Enrage, and possibly Guardians Strike. Recommend at least 2 boxes of Damage Decrease that is 16% from Expertise from Melee Profession, Teras Kasi, and Commando, for Jedi this means Guardian.
Bonus Expertise (Damage Debuff) - Such as Flurry (Teras Kasi), Thyroid Rupture (Combat Medic), Strangulation (Jedi - Mystic), Enfeeble (Beast Master Pet).
Bonus Expertise (DCD or Defense Cool Downs) - Such as Shields, Stand Fast / Void Walk, Decoy, Stasis, Force Barrier, Avoid Damage.
5-Piece Jewelry Set - Steel Body / Frontman's / Guardian's.
Medic/Doctor Role: Your role is to keep everyone healthy and alive.
Expertise - You will need Master Doctor for the Area Revive, also should have Stasis which will be needed to keep a player from dieing or boxing a target so it does no damage. Bonus if you can have both Doctor and Squad Leader you can provide Action Recovery and extra healing and one additional resurrect ability.
Bonus Preparation - Food/Drink granting either Swift Revive or Heal Potency along with PowerUps granting additional Heal Potency.
5-Piece Jewelry Set - First Responder's or General's if Squad Leader also, for Jedi use Sage Set.
GA or General's Aspect: Your role is to keep the groups action up by procing Inspiration from the Generals Jewelry Set, this can be done by abilities or proc damage off of default attack.
Expertise - You will need Master Squad Leader. You are support so use Toughen, High Yield, Rally Point (Defense/Offense), Charge, Scatter to help the group.
Bonus Preparation - This role can double as Medic/Doctor. Prefer to choose a weapon class that has proc damage such as Fencer and Carbines, or fast weapon such as Pistols or 1-Handed Swords.
5-Piece Jewelry Set - General's
DPS Role (Fill in Role): You are the damage dealer, recommend minimum 12k DPS, suggest 20k+ DPS.
Expertise - You will need Damage Stance, in addition recommend Bounty Hunter and Assassin for additional boosted DPS.
Bonus Preparation - Damage Stance, PowerUps - Weapon Damage.
5-Piece Jewelry Set - Anything to boost your DPS, Steel Body is a good balance for Melee characters but a more specific Jewelry Set may provide more DPS.
AoE DPS Role: You are a Area Damage Dealer, recommend minimum DPS for multiple targets 25k+.
Expertise - You will need either Grenadier, Heavy Weapon Specialist, or Pikeman.
Melee AoE DPS - Recommend Pikeman, may gain extra AoE from Bounty Hunter - Burn (Cone), Confusion Shot (Cone).
Ranged AoE DPS - Recommend Grenadier and/or Heavy Weapons.
Bonus Preparation - Damage Stance, PowerUps - Weapon Damage (Not for Grenadier they need specialized mods), Critical Damage Increase.
5-Piece Jewelry Set - Juggernaut, Grenadier, Hellstorm, Pikeman are recommended.
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