They have extensive documentation, user guides and YouTube tutorials, as well as a great community who can help out with any technical issues (links included at the bottom). Of all the trades I have done there, I have never once had an issue with the other party not paying, disputing the trade, or something similar, and never had to involve a mediator.
When you use it for the first time, your account is "unsigned" and has a limit of 0.01 BTC. Once you've done a few successful trades with trusted users, this limit will be lifted.
Wiki - https://bisq.wiki/Main_Page
Documentation - https://docs.bisq.network/
Simple "Getting Started" guide with videos - https://bisq.network/getting-started/
More in depth "Getting Started" guide - https://docs.bisq.network/getting-started.html
Forum - https://bisq.community/
Anyways I will check out bisq and will annoy you if required heh.