I just did mine and it was not difficult. The real important thing that you have to remember is to set the timing at No1 TDC then release the tensioner on the timing belt. DO NOT TURN THE CAMS WHEN REMOVING THE TIMING GEARS. I made a spanner wrench out of 3/4" round stock and a 1" x 1/4" flat bar. Welded them at 1-7/16" C-C. Just don't make it too wide since it must fit between the gear and the strut mount. After removing the timing gears, remove the distributor and the exhaust cam sensor but make sure the cams don't turn while doing that. You can remove the upper head now and remove the cams. Be sure to label the timing gears as to what cam they came from. Label the cams also. Now you can remove the head. Make sure you disconnect the water manifold flange that connects to the back of the head. I assuming that you have already removed the intake manifold and all the vacuum lines and labeled them and took a lot of photos. Disconnect the exhaust pipe from the exhaust manifold and if you have a turbo, remove that also. The exhaust manifold can stay attached to the head. You can remove that later.
When you reassemble the motor is when you will need the locking tool for the cams. I used a short 1-1/2" x 1-1/2" x 1/8 angle iron with two short pieces of 1-1/2" x 1/8 flat bar welded to it bolted to the holes for the distributor and the exhaust cam sensor. When you install the cams into this tool make sure that the lobes on No 1 point up away from both the exhaust valve and the intake valve.
I then used a heavy aluminum welding wire to hold the timing gear end up into the upper head, bending it around the bolts that anchor the top timing cover in place.
I hope that this will give you both help and hope doing this exciting job. When you get it all back together and it runs so much better, it is sooo rewarding.
When removing all the parts, look out for broken vacuum lines and the fire box. Clean it out with gasoline and air pressure. Don't remove the thermostat housing unless there is a problem with it.
Try not to curse too much, play soft music in the background. It helped me to have a few beers now and then. Good luck !!!