Let me start by saying that I don't feel like I'm a super newb anymore but I'm not an intermediate either... I feel like I'm kind of stuck in limbo land between the two and I'm not exactly sure how to proceed. I originally started doing RR&D 2.0 when I started at the gym. I feel like I outgrew that pretty quick though and started tweaking the routine to include more groups and it's finally morphed in what I think is a fullbody workout. My goal is to do mostly compound movements and hit lower body, upper body and back/arms during a workout. All exercises are 5x5 right now.
Monday - Incline DB Bench, Weighted Lunges, Standing Upright Row.
Tuesday - Cardio
Wednesday - Flat BB Bench, Full Squats, Lat Pulldowns
Thursday - Cardio
Friday - Incline BB Bench, Sumo Deadlifts, Seated Rows.
Saturday and Sunday are scheduled off days but in the course of the weekend we might hike, or swim or play some tennis and the like.
Any suggestions for my routine? I've been doing this routine for about 3 weeks now and I'm wondering how often I should change the routine? What type of changes should I make to change the routine? Like, is changing the reps/sets (i.e., 8x3 instead of 5x5) enough or should I change exercises?
Oh... I'm 31 years old and I'm 280lbs (started at 310 in back in December). My goal is just basic fitness but I feel like my progress is really slow.

I'm not an aspiring body builder or anything like that, just a fat guy that wants to be in shape. My diet is pretty clean... I'm trying real hard to follow the 10 rules outlined in Gourmet Nutrution and I think I've been doing a pretty good job.
Gah... I think I really need a trainer but I don't trust the people at my local gym.