I have a dremel tool and regularly make use of it. However, I didn't always have one and got on without one for quite a while! When starting out, a person might be able to get by without, by finding someone who does have one they can borrow (If your a member of a club, it is highly likely someone in the club will have one that can be borrowed). This goes for almost all the expensive equipment that has been suggested here! All of the suggestions I've seen recommended here is great equipment to have. I got to thinking about what is really needed to build that first kit. Then, after having built a few kits and determining building is an aspect of the hobby that is really enjoyed, by al means go out and by the stuff you want.

It's always NEED vs WANT in life!