Trying to pick some of my skills to go Legendary without effecting the game too much. Although I did reset my One-handed skill and it seems that it's not too much of a fault, I'd rather pick a skill that doesn't effect something as important as damage or DT.

I was thinking Lockpicking, considering you can always pick any sort of lock in the game regardless of skill level, and I have no perks invested in it anyway. Any other suggestions?

I would reset a skill that you don't use often. Like Smithing. Pretty easy to level up.

I actually advise doing Lockpicking. Sometimes you don't gain experience.

Speech is an obvious candidate (especially if you're quite wealthy).
Also I did Light Armor - now whenever I get smacked I level up! It's great because I get smacked a lot...
"Defensive" things make better candidates for Legendary than do "offensive" things.

And personally, I would never touch my Alchemy, Smithing or Enchanting.
Never reset a skill you don't use often!
Reset only skills you use constantly (but the experience is wasted because the skill is topped-out at 100).

Alteration plus telekinesis = win.

I havent tried telekinesis, but detect life in solitude levels alteration ridiculously fast, so does casting rally on a crowd of 7-8 allies.

100% Fortify Alteration while casting Teleknesis and Detect Life will level you up easy.

Ill have to try that, Ive never used tele, so I dont know how it works... do you just cast and hold the spell similar to detect life? I was dual casting detect life when I leveled, was that a waste of my second hand or what? lol

Yes, you can cast Tele like Detect Life. Equip both with your hands and cast away!

Basically this. You can use paralysis as well and level up extraordinarily fast. That's what I discovered when the patch first came out, anyway. I haven't played skyrim since.

Pickpocket.