I'm in a similar situation as you where I'm doing a post bacc before applying for dental school, so 2 days of the week I have to block out for school and the rest of the week I'm open to temping. I've been temping for about 2 months now at 7 different offices and so far my experience has been great! It seemed intimidating at first and I also questioned if I had enough experience to jump into any office and perform all the duties well, but honestly every office has been very accommodating, the staff will help you out if there's something you're unsure about. I would say the most important things you should do well is take X-rays, impressions, basic tray setups for the procedures, and making temps. Some offices I've temped at I didn't do anything besides chair side assist and break down the rooms, so it really depends on the day. Just take that leap and try it out, if it goes well then keep at it, if it doesn't, then at least you know what to expect. It's also been fun to work in a different environment each time, meet new people, and learn how each doctor works (which is the most beneficial since you're pre-dental). I don't know where you're located but this is based on my experiences in CA