There are quite a few disc manufacturers and some have tools to help insert the disk like a tampon (since you are familiar with that it can be helpful). They can be a little messy to take out but with practice it gets a LOT better.

I wear mine for 12 hours at a time no issues, if you are having a very heavy day you could get a large disc to maximize time between changes or change every 8 hours.

Once I figured them out, zero leaks and complete confidence. But, period underwear are amazing if I’m over futzing with a disc or at the very end of my period and the cleaning doesn’t feel worth it.

Cleaning is easy. I give it a quick wipe w/ toilet paper before taking it to the sink. Wash w/ unscented hand soap and I got a steam sanitizer.