I have read a lot of posts where ladies say they prefer to have the professional relaxers applied by a professional, but feel comfortable doing the store bought relaxers on their own.  Is there a major difference between the two?  Are the pro relaxers stronger or harder to apply?  Do you notice a difference in the way your hair turns out if you use a store brand  as opposed to pro?  I'm wondering because I'm still deciding whether to do my own retouch in February.  TIA