Changing 2nd Profession after Ascension

after ascending, you can change your secondary profession if you complete the xxx Path back in the crystal desert...my question is though, once i change it, will i be able to change it back to say my original secondary just as easily? Or is it a permanent change.

ex: im a monk/mesmer but just for farming or running id like to be a mo/w and make it easier...if i make this change to mo/w...will jumping back to mo/me be impossible or just a click away? no skills are lost in the process correct?

thx for any clarification

Just a click away, you got that right! Just talk to the desert folk, they'll do it instantly.

ahh i see, awesome, mo/w here i come! (till i jump back to mo/me lol)