If you have arcane spellcasting, you can cast magecraft for a +5.
Take 10 +5 (Magecraft) +4(ranks) + 1 (int) makes a DC 20 check easily
Even if you don't have spellcasting, guidance is a cleric orison, so should cost about 5gp for a casting
Take 10 +4 (ranks) +1(guidance 5 gp) +2 (Masterwork tool @ 50 gp) +3(intelligence) gets you there as well.
If you have a familiar or other buddy, the +2 aid another bonus can work as well.
A dwarf gets a racial +2 to stone/metal crafting.
So no need to burn a feat, really. What exactly do you want to make?