you don't need to remove the large nut off the crank pulley there are 6 10mm bolts around the inside of the pulley remove those. much easier.
there are two marks on the top of the timing cover rear housing, like arrows.turn the intake cam pulley so the ' I' mark lines up with that, and the exhaust so the 'E' lines up with the other mark.
the pulleys are a pain they tend to sit on the edge of the spring and you need 2 people to hold them from slipping, if they slip even tho it is only a tooth, the timing ends up wrong.
get a piece steel plate about 1/8 is fine, about 40mm x 40mm, drill a 3/8 hole through the centre, use one of the timing cover casing bolts and screw into the mounting hole in between the two cams.
you may need to pack it with a thicker washer to hold it.
It helps to put the plate in the vice and belt 2 diagonal corners over a bit this helps it lock onto the cam and hold it. don't do the bolt up too tight it is only 10mm and can break or strip the thread, also you just need it stiff enough that you can turn the cam pulleys to line them up properly, then nip up a bit. you can take the plate off after the belt is on.
its dead simple to line them up really.