Its just like any other transfer, but with more credits. Only a few schools, Rutgers is the only one I can think of off the top of my head, allow it and I think the ABA max is 45 credits. Your grades do not come with you at all in the transfer process, just credits. Your grades, on any level including undergrad, never come with you. You'll have to start a new GPA.
Its a full transfer, not a visit. The time table is insanely tight. Have your apps ready to send the day your grades come out after the fall semester.
I never knew you could transfer after 3 semesters. I double checked (just for my own info) and you're right, you can transfer to Rutgers after a year or after a year and a half and can transfer up to 42 credits. I never heard of this before. Good to know though.