Dressing Room is really easy to use and does all the swapping for you. You can have several builds with different gear and skills and change them at the touch of a button. I have a couple for my Magblade - PVP, PVE and one for Delves. The Delves one has all the skills for sneaking so I can basically cloak to the boss, kill and get out without having to kill trash (unless you need to). I finish the Delve, press F2 and select PVE/PVP and it's done.
I've also got an addon for CP that so I can change between PVE/PVP builds, it does cost 3k gold every time you use it but you can make that up selling trash gear/stealing.