Hi again,
Happy to hear that you've decided to pursue your dreams!

I'm not going to lie - it is a stressful process trying to balance a nutty work schedule and school. Just try to keep in mind that if it pays off it will all be worth it. On the flip side, if it doesn't pay off you'll know that at least you gave it your all.
To answer your questions - some of the schools will commend your ability to work and attend classes part time. However, if you have any blemishes from undergrad, they may come back to haunt you depending upon the program - at least it was that way for me. As for the PS, if I may answer you in a round about manner, I've got about five personal statements written that I have to just fuse together. I'm a veteran to this race... I'm 36 and this is my third application cycle (I also applied abroad unsuccessfully back in 2006) and it will be my last. If this go round doesn't work out, then it's time for me to get on with my life and stop beating the poor horse.
**BTW - I've been dying to use that particular icon, so thanks!!
Almost forgot! Applying to: Cornell, VMRCMV, Ohio, Illinois, and Colorado... Final goal: DVM/MPH
As for you, it sounds like you've got yourself off to a great start! You've decided that this is what you're going to do and you're going to take your time. That will certainly benefit both your application and your psyche. Way to go!! And let me know when you're planing upon takling the GRE - if you're doing it before next fall, I'd like to offer some help... I've got guides galore!! I was planning to sell them, but I think helping out a fellow masochist will help my karma immensely!
OK then, back to the insanity! Hope you have a smashing weekend!