There is a tab on this website for Fittings. If there is a Team Titleist fitter available, you can start there. Demo implies a chance to walk up to a table and be handed clubs to take a few whacks. Titleist fittings are all scheduled with trained fitters by appointment only. They typically last an hour so you get undivided attention to find the best match for you. The TT fittings charge $100 but can be fully applied to an order at that time Other sites will likely include a fitting fee and how much can be applied to an order varies.
If you want the 2021 release, schedule soon. The 2023 releases are starting to roll out early fittings. Soon only rack items in stores will be the remaining 2021 clubs.