If you were going for this via Piece by Piece you're spending a lot of CP to gain the 1200 necessary. Using steady hand or risking the 10% failure on piece by piece is up to you. However with out the CP it doesn't pass the true/false test which is common in programming.
Does Player Meet 15 cp requirement to use? True, next T/F statement of Is makers mark active T/F
Does Player Meet 15 CP requirement? False unable to use ability. It must past this test first if it doesnt your craft will no longer proceed. Simple Programmer Logic