You would lose 200 mp per 10 APRs (with 1st job mp skill on 0), I guess it depends on how many points you put into mp. Don't forget that you will regain your MP slowly as you level up
That's why you MP wash by adding fresh ap to MP. If you -HP in step 4, you'll lose (almost) all the HP that you just got, which is significantly harder for bishops to get than MP.
thanks a lot, so basically i add fresh AP to MP (to gain more mana pool) and SPR my skill to 0 and APR MP into HP and APR -MP then add back to my INT, is that correct?