Chaz,
I enlisted in 2004 to be a Rescue Swimmer. I thought I was decent in the water and was in good shape, I was wrong. I ended up DOR'ing the SAR program in Boot Camp and going dry Aircrew (not a common occurrence) Here is what I remember from then:
SAR is fucking hard. You have Aircrew Candidate school for the first month, which was difficult enough (0430 wake-up, breakfast, PT until 1030, class, lunch, swim until 1400, class, 1600 secure) but also included extracurricular swim training for the SAR Bubbas.
Then the SAR guys went to SAR school. Think LOTS of PT, LOTS of swimming, very personalized attention (small class, plenty of instructors) and fairly technical teaching. You have to be 100% motivated to make it through, the two classes that graduated when I was there were 3 out of the original 16 and 5 out of the original 20. I'm sure it isn't any easier today.
After SAR school you have your in-rate training (A-School) which is still in Pensacola along with the other schools. M/W/F you get up at 0530, go PT or hit the pool, and then have breakfast, hit school until 1200, an hour for lunch, then more school until 1600. There is also your standard watches, duty section, lots of boom-boom kitty fuck-fuck games (as in some 20 year old jack-waffle getting his rocks off making you swab the fourth deck) etc.
Following A-School, you will go to the FRS and learn your specific airframe. Then SERE school, then the fleet.
I love the Navy, and am making a career out of it. I would encourage anyone to do the same, but I don't want you going into it blind. You need good ASVAB scores to get in, you need motivation, to be in good/great shape, have a good sense in the water, and the humility to have your manhood questioned every day. SAR bubbas get lots of respect in the Navy, and they earn it.
As far as transferring out of the rate to another, it is needs of the Navy, I got lucky and found a spot as a Dry Aircrewman, but with PTS, ERB, and all the other down-sizing going on in the Navy today, you better be damn sure you are picking the right rate. You may find yourself undesignated or you may have another rate open. It also depends on why you attrited and what impression you made on the staff there, they will work for you if you work for them.
Depending on where you live, go find your recruiter, have him put you in touch with a rescue swimmer, or a SWCC/SEAL guy, and go work out with them once. It will open your eyes. Do an honest evaluation, and if you find yourself short, pick a different rate, or do some more work before you enlist. I had my realization a little late (boot camp) and was lucky to have an ASVAB of 99, a degree, and a very good Chief, I could pick whatever rate I wanted.
Finally, realize it is 90% mental. Your outward persona will be judged way more than how many push-ups you can do. That includes your reaction to stressors, your ability to lead and follow, and how well you work as a team. I would suggest you start working on your grammar around here, it was hard to pick through your original post (I hate reading text messages), and you will get more/better responses if you use the English language as designed.
Good luck, I hope this helps.
Pickle