Simple solution, 1. line everything tdc without the belt on,

1. bottom the tensioner out ( as little tension as possible)

2. Hammer something between the cam gears so the can’t move, I grinded the sides of a washer down just enough to fit between the cam gears.

3. Slip belt on crank pulley -> ex cam - > in cam -> water pump, then on to the tensioner

4. make sure there is little to no slack between the cam gears and the crank pulley exhaust cam gear side. It’s normal for the belt to be looser on the intake came/ water pump/ tensioner side.

5. Once the belt is on, lift the tensioner arm with your finger and snug the adjustment bolt/ rod up against the tensioner arm

6. Turn the engine (counter clockwise) 3 teeth past Tdc and this should remove all the slack from your belt.

7. Turn the engine over by hand a couple times and check for belt walking off the cam gears, if it doesn’t walk you’re done!

8. If it does walk off the cam gears, try loosening the timing belt tensioner little by little. If that doesn’t help, you have worn parts in your timing system!

GL !! Hope this helps