This is numpty to numpty advice, but as I’ve just replaced my first pressfit BB I am one step ahead!
In terms of which BB you need, I found a call to the bike manufacturer put my mind at ease that I was looking at the right one to buy. It’s broadly shell width, cup diameter and crank diameter that these things vary by. So I suppose if you measure those you’re in the right starting place?
The Ride cranks are 24mm according to the RF website (https://www.raceface.com/products/details/ride-cranks)
In terms of removing and fitting, I used a 10mm socket on the end of an extension and a soft mallet which removed (and destroyed) the old BB (which was knackered anyway), and then I bought from ebay a cheap tool to press in the new BB. Both jobs probably took 5 minutes each without a hitch.
Not much help, but it’s all I’ve got!