mike1762 to refinish a bass, car, furniture you need to have some very good equipment and be prepared to spend a lot of time and effort.
Using chemical strippers requires some research as not to damage the underlying wood and you need personal protective clothing.
Sandpaper in various grades plus the power tools to attach it to, rotary sanders, recipricating sanders, fine grinding pastes etc.
Then there is the finish itself, if you were to hand wax it then that would be easier but to spray the bass you would need thinners, the finish, an airless spray system, somewhere to spray it AND all the protective clothing and positive pressure air breathing hoods. The place to spray is not your garage but preferably an warm room with dust/fume extraction.
It maybe cheaper to get someone to do it for you rather the massive expense of buying all the gear to do it.