Also this is not to put you off but to help you out , get the right tool and I'm not in about halfords shit, I'm on about all the DTI garages etc as if you don't any of these you might as well not bother as you need to check the work you have done etc.
i see so many DIY build that go wrong due to people not knowing what there doing etc (not saying you don't and also I know there are some tuners out there that don't know what there doing)
get your self some millers engine lub as this will help with installing parts.
Also build the engine is a dust free room etc i don't know if people have already said this but any bit of dust will damage the engine befor you even start it.
building engines is not like playing with Lego.