Have no fear, if no valves are bent your OK and it's easy to get it back in time and install the other belt.
FIRST, the best thing to do is loosen up ALL the rocker adjusters completely.
This will help avoid bumping a valve because you'll need to rotate the crank to get it in time for the other belt.
Now, rotate the crank past 2 TDC slowly feeling for any resistance.
Since the pistons will now be down in the bores you can safely rotate the cam separately.
Turn the cam so the UP is up and timing mark is set for that cam.
Next rotate the crank to 1TDC and install the belt.
Hand crank to feel for resistance and double check both cams timing.
Adjust the valve and hand crank again feeling for resistance, again verify timing marks are good on both cams.
Let us know if you get stuck and how you make out.