I just finished Step 3 at our state school for the deaf (evening classes once a week for 10 weeks). I don't practice as much as I should. Lately, while taking my evening walk, I will fingerspell two prayers (Hail Mary & The Lord's Prayer) to give me practice fingerspelling. I will also visualize some of the signs I've learned in class. I just feel a little weird "talking to myself" while walking out in public. 
My daughter, who is also taking the classes with me...and picking up on it a lot faster than my "old" brain, and I will sometimes sign with each other, especially when I don't have my HAs in.