- Use a condenser microphone with a pop filter for vocals
- Use 2 matched condenser mics for acoustic instruments, separated by twice the distance to the instrument, pan them left and right
- Use a dozen cheap foam panels to reduce unwanted room sound (placed closer to the vocals/instrument depending on situation). I tacked mine to a sheet of plywood so that it could be moved around.
- Eat a banana before singing to help improve vocal quality
- It will never sound as good as you want, but the most important thing is the performance. People will put up with imperfect recordings if the performance is good.