I majored in Mechanical Engineering (with a Math minor) at UofA, graduated in 2008. I basically had a full-ride 4-year scholarship, so I made sure I finished in 4 years. Sure, some of the course work can be challenging, but it's all do-able if you dedicate yourself. I will say I did not hold a job during the school year, only during the summers. This makes a big difference. There was many-a-times in my upper division work where I may have had 18 credits, but outside course work easily totaled 50+ hours a week.
I was hired by Honeywell prior to graduation here in Phoenix, working in R&D on turbine engines. I've been working for them since June of 2008. I'm essentially a Structures Engineer, specializing in static structures (all the pieces that are not rotating). I primarily work on engines intended for Military (domestic and foreign) and/or Helicopter applications. And I love what I do.
Before I obtained my Bachelors, I always thought I'd move on to pursue a Masters. While I can't say that's a complete impossibility, but after killing myself for 4 years, I was pretty burnt out on school. Now after being in the industry and seeing the value of experience over education, I'm not sure going back to school is something I'd ever consider. Oh, and getting a full-time paycheck is kinda nice too.
Best of luck to you. And it's interesting to read other's stories as well.