Hard to do lifters?

By DO, must I assume you mean replace?

To replace your lifters, you will need to remove the upper and lower intake manifold, and the dogbones and retainer that is held to the lifter valley with 2 small bolts. You will also need to loosen your rocker arms enough for you to pull out the pushrods. Once you've done that, you can remove the old lifters and replace them with new lifters.

I don't see how over torque of the rocker studs would bend them. You're tightening the rocker stud at the hex at the base of the rocker stud, so how would that bend the stud itself?

Anyway....

If you are running the Trick Flow top end kit, you have poly locks on the rockers. Loosen and remove the poly locks and the rocker arms. Remove the rocker studs. When installing the new rocker studs, put thread sealer on the bottom threads of the stud (that thread into the head) and torque to spec. Install the rocker arms and adjust the rocker arms one at a time. Make sure you follow the procedure for adjusting rocker arms by achieving zero lash on the base circle of each cam lobe, and then adding 1/2 or 3/4 turn or whatever trick flow recommends to get the proper lifter preload.