Remember the Thunders were consolidated, so that's one less skill (or a double, depending on your hotbars) to worry about.
Before you click off the unavailable skills, I recommend opening the Role skill menu and checking if they're there. If so, re-place them where you're used to having them.
Remove the rest of the unavailable skills and have a go at the dummy. Familiarize yourself with the new job gouge, place it somewhere it'll be easy for you to look at.
It should at least get you comfortable enough to give it a shot.