Joe - Best bet is to use the LBS, if they are OK they may let you loose in their workshop. For my build I got the tools as I purchased the parts, unless it's a high value tool, then I used the LBS. You will find plenty of examples of home made tools - but always use the correct tool for the job.
Took the frame up to the LBS and for a fiver they did it with me. Much better than using a homemade bodge on a thirty five quid headset. I've also seen the hammer merchants on u-tube - have they no respect for their bike ?
Now in possession of a modern work of art - the Surly Steamroller frame - next job is to press the headset in - anyone got the right tool I can borrow ?
I'm foolishly doing the long one - say hello if you see a bloke on a blue Bob Jackson