Guys---there is absolutely NO REASON to run the cylinder to TDC before removing/replacing the rocker arms.
The FSM DOES caution to loosen the rocker retaining bolts one turn at a time, alternating back and forth between the pair, so as to prevent distorting the saddle bracket on top of the pair of rockers. Likewise, tightening them is done the same way--1 turn per time, alternating. Final bolt torque is 21 ft-lbs.
1992 XJ -- stock (RIP)
2000 XJ -- lots of basic mods. Sold to fellow forum member. I miss it.
2014 JK -- the project is just starting!