Well I hear that replacing the head on a SOHC such as an m20 or m30 isn't that difficult because setting the timing can be fairly straight forward. Now I am thinking of perhaps reconditioning the head on my m50 at some stage. Is it a difficult job and do i need any special tools for setting up the timing.

I do have access to some extremely knowledgeable mechanics through my work as well as their tools so it shouldn't be too intimidating. I've always wanted to get into this stuff and now with the winter approaching here (read it will not be 40 degrees celsius during most of the day at work) might be a good time to do it.

I suppose the part that I am most unsure about is setting the timing for the DOHC after putting the head back on. What techniques are used for this?