I would say this is not a trip to do if you only have backpacking experience. I did the MR last year and I could not have done it without the guides we hired.
The snow chute up from Iceberg wasn't too bad but the final climb on the rocks would be outright daunting if I didn't have someone showing me how to go up or down. I posted a story about it last year if you search my posts. Lots of details about how gnarly it was!
My opinion would be to first have someone show you how to safely do the MR then do it again on your own if you felt confident enough.
Even with doing it last year with a guide, I wouldn't do it again without a guide because I really didnt learn enough to do it on my own. Maybe my next trip with a guide will involve learning a bit more about rope and knot skills and how to deal with members of the group who a dropping like flies from AMS.
http://www.whitneyzone.com/wz/ubbthreads.php/topics/55759/Tuesday_July_16_Mountaineer_Ro#Post55759
