For small projects where you have the time, a small blaster will work. Your biggest issues will be air supply/air quality, but if you are not on a tight timeline you can make it work. As mentioned, a blaster can stress out a small compressor and moisture will make you pull your hair out, but there are ways to improve these two problems if you want to do them. We started out with a small pot, but soon realized (with the amount of blasting we do) it wasn't getting the job done. We rented a larger system a few times before buying our own (200 CPM compressor and 350 lbs pot). If time/aggravation are concerns, perhaps renting is a better option.
We use duck tape around the sensitive areas to help keep the sand out. It won't take a direct hit from the blaster, so you have to keep some distance. We have used Black Beauty in our blasting cabinet, but in the pot we use 35-65 blasting sand.