Well, it's a massive pain and a stupid idea...... unless you have the right tools. Seriously, get the right tools for the job, and so long as you have a natural mechanical inclination, you will be fine.
My personal thoughts are get not only the right tool, but get a quality tool as well -the downside? It can be very expensive to get yourself setup that's all. But good luck, you will be fine!
*another poster alluded to this, but also make sure you are knowledgeable about the frame -e.g. an older Raleigh frame can't take modern bbs without some serious messing around.... be aware an older road frame won't necessarily take a 700c wheelset -even with extra long reach brake calipres!