I teach in an RN-BSN program. I also work in a hospital and have several friends who are in RN-BSN programs.
The big questions are:
1. How many courses do you plan to take per semester?
2. Are you planning to attend a school whose RN-BSN program is equal in academic rigor to traditional BSN programs?
The fact is that some schools
are more rigorous than others and require more committment on the part of the student. If a program requires a level of work and committment equal to a traditional, high-quality education ... a "full time" student should expect to work the number of hours equivalent to a "full time" job -- 35-40 hours per week. With such a program, it is almost impossible to do a good job if you both work full time and go to school full time. However, it would be possible to do one (work or school) full time while doing the other on a part time basis. It would also be possible to do both on a part time basis. Most of the people I know do one (either work or school) full time and the other on a part time basis. In other words, they either work full time and take 1 or 2 courses per semester ... or they go to school full time and only work part time.
However, there are a lot of RN-BSN programs out there that are not all that rigorous. They may require a lot of "busy-work" to complete, but they don't require the deep intellectual work that necessitates you spend 10 hours per course per week. If that's the type of program you are planning to attend, then you may be able to handle more working and/or more courses per semester.
When I hear about people working full time while also going to school full time ... I figure they are either doing a bad job at both ... or they are going to a very easy school. It is not reasonable to expect yourself to work 40 hours per week and also go to school 40 hours per week. That just doesn't add up to any sort of schedule you can maintain for very long, and the quality of your work (and life in general) is bound to suffer.