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Easy way would be taking #1 spark plug out and inserting an extra long screwdriver down the shaft. Hand rotate (do not crank start!) the engine until you see the screwdriver go up all the way. When it looks like it's about to go down reverse rotation and get it back up to the top. When you remove valve cover and timing cover you will see timing marks on the block and head.
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An easier way to do that is to just rotate the crank and watch when the lower timing mark hits the 0 pointer. No need to put screwdrivers in. Plus remember that a 4 stroke engine takes 720degrees to complete the events in one cylinder, therefor even if you look at the screw driver, it can either be at TDC or it can be on the last part of the exhaust phase.
