lothakoun wrote:
is it expensive using the potions?
Depends, Lower lvl skills don't cost too much; although "expensive" is relative.
(Every lvl gets more expensive, lvl 77 skills cost me 300k+ per skill; lvl 35 skills cost me 15k or so)
And it's not required to delvl the skills immediately, U can use them until u have enough so the cost of delvling won't cut too much in your wallot

I suggest u get 1 potion, check how much it would cost to delvl the highest lvl skill & then decide if u can easily delvl it all, as u have money enough; OR delvl later when u have some more money.