The pre-reqs arent bad, and yes you should be able to work while doing them. Just remember, it is vital you put as much effort as you can into getting good grades in these classes, so adjust your work as you need.
If you are flexible about work, you should not have a problem getting a job. I worked part time (20 hours a week) as a CNA while in clinicals (already had the CNA) Did alot of weekends and night shifts, but I did not have much of a choice. Like I said, I also have a family and managed a 4.0 gpa while in school and working, so I know it can be done. Yes I felt like I was unravelling a couple of times, but I made it.
As far as finding a job as an LPN, they are out there. I had a job waiting for me the Monday after graduation. Several of my classmates did as well. Check out career builder and seach for LPN in your area. There are lots of opportunities out there.