This is a big job that will take some time to do properly.
If you get the valves and guides done which is worth doing given the amount of work involved to do head gaskets you are going to need a spring compressor and go/no-go gauge to readjust the valve "clearances".
Have a look through koan gallery
, in "Tools" you'll see my DIY bent allen key done with heat, and my DIY spring compressor design. Also under "Engine work" there's a few pictures taken during the job.
Also in my gallery in "Misc" on the second page is "M100_head_bolt_caution" which is about the spacer on front head bolt of LHS head.
One problem I encountered was getting the inlet manifold off, the EGR pipe gets stuck under the cylinder head overhang, it's a pain.
I seem to remember having to undo engine mounts and jack the engine up to get exhaust manifolds off.
As I said it's a big job and there's lots of other things that may be worth replacing along the way, timing chain, chain guides, tensioner rail, previously mentioned crank seal... it goes on and on...