91ZCRX

I took of the valve cover and the timing belt cover to adjust my valves. I noticed when i tried to get the #1 cylinder at TDC one of the cam gears was off by a tooth and it seemed like the belt was a little loose. Exactly how hard is it to do a timing job on a crx or do i have to "re-time" it to fix it. How do i figure which cam is off one tooth...? Help me out if ya can, Thanks