You guys got me scared of tti headers!

Not to scare you but;
on the initial install, back out the T-bars, bolt the headers on with just two bolts, then bring the bars back in. Make sure you have at least 1/4 inch clearance all round the bars. BASH the tubes, already!! Just bash 'em in the right place, the right amount and then forget about the event forever. Get a fence-post-sledge, like a 5 pounder, it's way easier to control the force than wailing on the pipe with a 10oz toy-hammer; those TTIs are real metal! For forming,use a solid bar,bigger than the t-bar, and properly support the tube you're pounding on. With the 5 pounder, don't give it all you got,lol, easy does it. Each successive drop will require just a bit more force.
When you back out the T-bar adjusters, with the wheels hanging down, count the turns, and put 'em back to that, later.Don't be afraid of this, it's no big deal. Besides, you just might find out that your LCA bushings have turned to jelly, lol, and you'll have to deal with that, BEFORE smooshing the tubes.This is because after the new bushings are in, the bars will be in a different spot, and you might have to re-adjust your smooshing,lol.
Get yourself a case of shorty oil-filters. 51085 IIRC.
IIRC, the driver-side goes in from the bottom.......... Or was it the passenger-side?............ or maybe it was both sides...........Oh heck I forget; it was like 2005, the last time they were out. OK I think the D-side had to go in from the top, and the P-side from the bottom, And maybe the engine was suspended from the picker, soz I could push it around some? Yeah that sounds about right,lol.