Lets say I want to craft a Belt of Giant Strength +2.
It has a Caster Level of 8 and a requirement of Craft Wonderous Item and Bull's Strength.
Lets say I meet those requirements but I'm 6th level. Can I craft the belt?
In the rules it says that if you don't meet a requirement to make a magic item, you can bump up the DC by 5.
So if I'm 6th level, can I just bump up the DC to make the item form 13 to 18? Or do I have to be 8th level to make it?