Kenobi65 - Sorry to hear you had a bad time. Were you playing at a regular field, or out with friends? I have heard stories about people playing outlaw (ie. not at a field) ball and playing with unchronographed guns (pc - markers). Usually shooting at 300+ FPS, which can really hurt a person.
Umbran - You probably already know this, but I will say it anyways, be sure to wear protective eyewear, even with airsoft guns. I've played airsoft a few times, it was fun, but there were times when you had no clue you had been hit because of clothing, etc.
Krunchyfrogg - heh, love the name! That's what we named a building at a MOUT site we played at, Crunchy Frog's Cantina (taken from misremembering the name of a bar in town called Crazy Frogs). As for playing against "regulars", the problem for a field is that there may not be enough players out there to split the two groups. So it becomes a question of what are the regulars supposed to do then? We (my team) have been asked in the past to "tone it down" some. I agree with that to a point, but even then, why should the experienced player be forced to not play his or her best? I am not a tournament player, and don't have a fast trigger, but I have been accused of playing to hard before because I managed to get around the backside of the opposing team. It isn't just a problem for the "non-regulars", it is a problem for those of us that have played for awhile as well. The only way you are going to get a level playing field like you want is to pay extra for a private group. Then it is just you and your friends, and you all have the same guns. Beyond that it is just getting out there and playing, and if you enjoy it, learning how to beat those howitzers.
The other thing to consider is trying another field. Not all fields have experienced players running around with high dollar guns. In Houston, there are two fields that most of the experienced players go to, and several that cater to the players with little experience.
Finally, try a scenario. You have role-playing (so far I have played a major character twice, once I managed to break the casino at a mobs game by figuring out a no-lose system and the second time I had to do a dance for the greek oracle giving visions... she said she would never ask a member of my team to dance again... heh), actual missions that affect the outcome of the game, and can play anywhere on the field for as long as you want to, as long as you can get there without getting shot. Plus you have lots of targets and friends. Most games are around 200+ on a single field at the same time, though I have been to games with over 1200 players on the field. I even played with William Shatner at his first charity paintball game in Chicago. Many people may dog the man, but he was a lot of fun, and he stayed on the field the majority of the day playing. Of course, he had a personal bodyguard named Ike who carried a shield everywhere he went to block shots on Mr. Shatner, but those are the perks!