I have had good luck in using the '1/6 turn out on the adjuster method'. The hardest part is finding TDC AFTER the intake stroke. Then you lightly seat the slotted adjuster on top of each valve, then line up a castle on the nut with the adjuster slot, and make a mark on the surrounding head material, where the adjuster slot would be, when backed off 1/6 of a turn. The nut has 6 points, so line it up and use one point. Back off the adjuster, tighten up, go to next valve. Sounds tricky, but has worked for me. I got this method on KTMTalk, you might search there also.
Warning, if you don't get the proper TDC, this method will not work.