If you're pretty confident, head over to xda developers.
Theres a sub forum for every Android phone, and shows how to root your phone (admin access) takes 30 seconfs to actually do the procedure!!! Once rooted, there's apps that allow you to transfer your apps tonthr sd card. And there is a eay to combine both the sd and phone memory together. But would recommend buying class 10 card which would be fast enough to allow you to do this.
Also, there's reports of the make San Disk which can die? I've got Kingston in mins, and never haf a problem.