The worst thing you can do is underprice yourself.

We're not anti-amateur or against semi-pros on this forum, the opposite in fact.
The temptation is to go in cheap because you want the job. It may be that you're doing it more for fun than for money but, here's the strangest thing, the cheaper you are, the worse you'll be treated. Contrary to what you may assume, people aren't grateful that you're doing the job for next to nothing. If you get paid peanuts, you'll be treated like a monkey.

So, if you want to enjoy your work, insist on high prices, you'll be well treated and can afford to spend the exra on renting equipment to do a better job.