I am doing the same thing now, I have been using Cubase since SX3. One of the first things I had to figure out is that in Cubase bounce is the same as combine in Pro Tools and Bounce in Pro Tolls is the same as it was in Tape day, which actually makes sense ;-)
I have found that simply immersing myself in it and doing a lot of searching the web when I get stuck is helping a lot.
punching in is a little different as well, instead of highlighting and selecting the punch in and out as you are used to, you highlight the actual track section, turn on the pre and post roll at the top, you can then adjust the little flags on top for pre and post roll. you can manually drag them or change the number value next to pre and post. The big difference is you arm the track and actually press record as opposed to just play like in Cubase.
Using play lists and clips is a little different than the pool window, I find it pretty easy in Pro Tools and I think I like it better. Search on using play lists.
Nudge, I know this is a huge editing tool, there is a nudge amount you can sett, loot up at th e top, the numeric keypad + / - are all you need, works well.
I know a HUGE difference is the lack of input monitoring on and off, this actually is only available if you are using the HD version, I was disappointed in this, but I am just pulling the fader down.
I am learning a lot by just diving in and doing.
I will add more as I come across it.
Looking forward to reading your findings as well as others
Drummer / Audio Enthusiast www.robertmdrums.com
I'm old so I have accumulated a lot of gear