Good enough groups for newbie self-defense?

[LT.Diver]

You should be able to hit a 10 inch pie plate at any distance with either hand, long arm or handgun, stationary, moving to cover, laying down, crouching, etc. When you can do that, you're good enough.

 

[9mmepiphany]

I'd actually try to get my skill level to a 6" paper plate (only because they don't make a 5" one)...as the rule of thumb is that your effectiveness (ability to hit your target) goes down by 50% under pressure