I did mine myself about half a year ago so my memory is a little hazy.
I set it to TDC using the timing tool and cam alignment bar.
I removed the bar once I had it set and used two large open ended wrenches to hold the cams in place, I think a 22mm and a 20mm, while I loosened the cam gears that allowed me to put the new belt on. I tried to replace the belt first without loosening both gears but it was impossible since the timing was slightly off, the belt wouldn't fit properly.
Also, the intake cam with the VCT would sort of spring back in place when I adjusted it. It wouldn't always spring back in the proper spot but I kept adjusting the cam until it would naturally rest at TDC which I double checked with the cam alignment bar.
The cam bolt for the exhaust cam was also quite a pain in the arse so I replaced that with a cam bolt from CFM to make things a lot easier.
I put everything back together and I guess I got lucky on the first try. I've driven it about 7000 miles since and had no issues.