replacing old c-notch

ok so i need to know how bad is it gonna be this weekend when i have to take out the c notch i have now.....and put in another one. i just dont know how to go about making sure the frame doesnt move and i dunno if where the frame was caut before what to do if this notch is smaller length wise.....so i dunno if anyones got any ideas on how to go about this....somebody on heres probably done it before.

what if you take 2 pieces of tubing, bend a curve on each end and weld the front of the tube in front of where the notch was welded in and the back of the tube behind where the notch was welded in and when you cut the notch out the frame won't move because you welded that brace in there...just a thought

slide a peice of 2x3 in the stock fram where its cut out for the nothc,weld that in so the frame wont move when u cut off the old notch,then weld in the new notch and cut the 2x3 and however much more frame u have to,thats wat i did on my fullsize,rather then backhalfing it.

I feel your pain...I have to do the same thing cause my notch is too small it ownt lay on a bigger wheel than a 17