Hi, I am also a new to here and I have the same problem. I am currently building a beetleweight as my first robot and planing to build a featherweight. I do not own any workshop, so I send the CAD drawing to a workshop which offers a machining services. This is expensive, I am a little regret. I do a little mechanical work in my room, on my bed with some wood sheets on it, it is big enough and space-saving. I found it is better to go to a open place to saw something, especially plastic, scraps will fly everywhere. Tools I use are a wrench set from 1-10, a mini screwdriver set, a saw and a drill as the only power tool. I think a vise is very useful but it is diffifult to install.
Placing some wood sheets on the bed as a simple workbrench is my advise, waiting for experienced builders' advises.