There are special tools that lock the flywheel from underneath at the flywheel and a bridge piece that goes across the tops of the cams to time them correctly. The timing chain tensioners fail on those a lot make sure you get the most up to date tensioner they were up dated three or four times. We used to do a lot of them. Its best to have illustrations. There is a company that independent auto repair shops get their information from, this same information is available inexpensively for people that work on their own cars.