I just started shooting IDPA this past year, and was looking at USPSA. I have been told by a few different people that USPSA is more competitive, and if I am not that good, will feel uncomfortable, because i will be holding up the rest of the shooters. Is there any truth to this? I am curious, because i don't want to jump into something over my head. Also, can you use stock pistols, or do you need to have a super expensive custom gun?? Thanks