LevelWing
Pre-takeoff checklist
How does renting a glider work? Is it like renting an airplane, do a short checkout flight (one tow?) with their CFI and then you're good to go?
Like everything, it depends. But yes, it could be taking a tow with an instructor. Or taking a couple of pattern tows.
Just to add some context, it depends on if it's a commercial outfit or a club. Commercial outfits are as @Lindberg posted; could be a couple of tows depending on if they want to see a rope break or not. If you only have clubs near you, you'll likely have to join the club and SSA before they allow you to rent.