How to Reset Timing Again - Help Please

#1
2000 Toyota Corolla LE 4drs Sedan: Egine 1ZZ-FE. Please help I made a mistake:

1. I marked the two camshaft sprockets and the timing chain but forgot to mark the crankshaft pulley.

2. Took the timming chain off the camshaft sprockets

3. As I inserted air into the valve chamber to hold the valve in place while replace the valve seal, air caused the crankshaft to turn and consequently caused the pistons out of sync with the valve timing now.

How do I reset the timing so that everything will be in sync or in timing again.

Many many thanks.
 
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