Don't forget to READ, READ, READ and then READ some more! there is so much stuff on the intermenet thingy to help us out.
I bought a multi-meter, only used it a few times, but yah, it helped me to realise i left some jumper wires out! i think mine was around R200 from yebo, it can measure the usual aswell as transistor hfe... whatever that is. (I will get there!)
I think I listed the things I bought under
http://www.guitarforum.co.za/setup-mods-and-repair/my-first-pedal-build!/msg27283/?topicseen#msg27283, but I left out a drill, soldering iron, solder sucker and solder cos i had those already.
If you keen on the DOD 250, then this link is invaluable!
http://gaussmarkov.net/wordpress/circuits/overdrive-250/
there are links to the schematic, parts list, pcb layout, etc.