Changing Sub-Class - ALL sub class skills lost and no turnback ?

i know there are path quests in oasis which allow you to change your sub class.

However, how many times we can change our sub-class ? Infinite or just once ?

Most important, can i turn back to my original sub-class if i dont like the new one, and kept my skill i learned before ?

For instance, i am a W/M, if i change to W/E, and hate it, can i turn back to W/M again and have the monk skills remained ?

Would like to try something new but still worry about that

Thanks in advance ~

Yes, you will still know those skills. You can change classes infinite amount of times. I have changed from a W/Me to a W/Mo, then to a W/E, then back to a W/Mo! :P

Wow, are you serious? You can change infinite times? I guess that would be great for testing out characters and having some fun near the end, but it would have been more fun if you could switch closer to the beginning of the game.