| CrazyGramma,
Sounds like you have a plan. I found that I am just not a runner, but that is ok. The elliptical trainer has turned out to be much gentler on me and still gives me a heck of a workout. You can crank the resistance right up there. My best advice to you would be to seek out a social aspect to this exercise endeavor. Do the classes like you have been doing, but also seek out others who you can join in a social group to collectively undertake your transformation. I have a workout partner and I know at times I would have slacked off without him.
You also should be able to find some rehab exercises to help with your shoulder and tendon issues. Even a single trip to a physical therapist could reap you a set of exercises you could do on your own. You might also consider how a chiropractor, particuarly one who uses active release techniques might help your shoulder.
Good luck
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...brian
T2 since 7/05. 48 yrs. 5'11 195 lbs.
Exercise, very low carb diet
HbA1c 9/07 - 6.3%, 3/08 - 6.2%, 6/08 - 6.2% | 
