http://www.youtube.com/watch?v=Q2GMKEJ_6S8
Sindragosa is a rather difficult encounter, especially if your group has never attempted it before. One of the more difficult aspects of the encounter is managing the tank swap amongst all the chaos of phase 2.
Solo tanking Sindragosa can make the encounter significantly easier on everyone... kind of. Healers no longer need to deal with abruptly swapping targets and the raid gains an additional healer or dps which can make all the difference, trust me.
But attempting this is no minor feat, by the end of the fight her breaths will be hitting you for well over 70k, which is why you need a frost resistance set to lessen that damage.
There are many raid viable items with frost resistance on them, I do not suggest equipping them all as it may impact on your more vital stats too greatly. Getting your frost resistance near to 350 unbuffed is ideal.
Here is a list of the best frost resistance items and enchantments you want.
Head
Frostforged Greathelm (Death Knight)
Helm of Wrath (Warrior)
Judgement Heaume (Paladin)
Stormrage Coverlet (Druid)
Back
Enchant Cloak - Superior Frost Resistance
Chest
Icebane Chestguard (Plate)
Polar Vest (Leather)
Belt
Icebane Girdle (Plate)
Polar Cord (Leather)
Feet
Icebane Treads (Plate)
Polar Boots (Leather)
Ring
Titanium Frostguard Ring
Trinket
Sindragosa's Flawless Fang which, ironically, you have to defeat Sindragosa to obtain.
I also suggest investing in a few
Lesser Flasks of Resistance, they are a
REALLY big help.
Of course this gear will most likely drop you below the defense cap and reduce your health by a few thousand. The lost health isn't a problem but the defense is, I suggest using
the WoWhead profiler (make an account first so you can save the profile afterwards) to plan how to gem your gear so that you will be defense capped again.
With most of that gear, the flask and a Frost Resistance Aura/Totem you will have well over 500 frost resistance which should about halve all incoming frost damage. Making solo tanking Sindragosa easily solo tankable if you have decent gear. And for the love of God, MAKE SURE YOU'RE DEFENSE CAPPED mkay?