That is why there is the reset at lvl 15 or retirement at 31 or option to roll an alt?
Edit: I can see why they should not be punished for making mistakes, but i cannot see reason for this, if you got low lvl, you can just roll a new one or retire at 15, so this is quite unneeded. Lvling to 18-20 takes one evening these days.
If you want to try spec out, make an insta lvl 30 and play to see, how it feels. Then delete it and start leveling ur main char, easy.