you will need a timing strobe, a couple of spanners and maybe a dab of white paint / liquid paper / tippex and a marker pen.
under the distributor is a nut 15mm if I recall if you slacken it off the distributor rotates to advance and retard the timing.
before you start, check the book setting for timing position and the timing set process
1. mark the current setting to a point on the engine (not the distributor) with the marker pen.
2. get your ass under the front and remove the splash guard to get access to the pulley
3. clean the pulley and you'll see the timing markings. there's no point even getting the strobe out unless you can see the markings
4. put a little dab of white on where the correct angle should be if you choose.
5.look down from the top (distributor) and you'll see a pin / marker for you to set he timing up to.
6. slacken the distributor clamp with the 15mm spanner. you've marked the position where it was so if you balls up you can go bck to where you were
7.set up the strobe light, making sure cables are out of the way of spinning things
8. start her up, remove the vac hose and shine the strobe light on to the pulley from the top, you'll see the white mark. at the stated rpm turn the distributor until the correct advance / retard angle is in line with the pin/marker.
stop engine
tighten clamp., reattach vac hose. timing should be set