You can Craft and Perform, but you can't use Profession;

As stated here, Craft and Perform can be used without training. This means that you don't need to have ranks to use any of the Craft Skills (not limited to Alchemy, Armors, Bows, Traps, Weapons, Varies) or Perform Skills (not limited to Act, Comedy, Dance, Keyboard Instruments, Oratory, Percussion Instruments, String Instruments, Wind Instruments, Sing).

Unfortunately, this does not apply for Profession, and you'll have to get at least 1 rank in a Profession to use it.

It's worth noticing that every failure in a Perform check will give you a -2 when trying to Perform in front of the same audience (because they were not impressed by you and now have prejudices). Be aware of that and use Perform wisely when you don't have ranks in it.



Misc Bonuses

If you don't want to get ranks in these skills, there is still something we can do to improve your checks.

Artisan's Tools: You may want to get these to get a +2 on every Craft check;

Gnome Racial Trait: Gnomes get +2 to a Crafting Skill of their choice.

Masterwork Musical Instrument: If used during the performance, it will grant a +2 on the Perform check.

Skill Focus (feat): Choose a Skill; Without any rank in it, this feat gives you +3 on every check for that Skill (you can get up to +6 when you have 10 ranks, but this is not the case).

Can you designate your craft, perform, or profession skill even if you have no ranks in it?
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