Your goals are realistic, but you’ll need to have enough work out days during the week. I’m sure you can do stretches at anytime during the week. Have a look at the stretching part of the newbie’s routines.
Many have gained girth with the bathmate, the main problem is the lack of gauge, which makes it more difficult to monitor the intensity of the work out. Basically you should avoid edema (lymphocele + much thicker skin). Thicker skin is likely to happen but it should go away quick.