TTI Headers before Trans or after ???

i did mine with the engine in and out (had the engine in and out a few times now) i found it the easiest when they were in place and i dropped the engine in after, the tranny was in then. if the engine is just in at the motor mounts maybe lift it back out and get the headers in first. ALSO protect them with thick clean rags or something around mounted components or you may risk damaging the finish around the steering box and t bars and such. i scratched mine up and it sucks.