Hi K. :) My husband grew up in El Cajon, small world!
Anyway, our daughter started throwing fits about sleeping in her crib at 1.5 so thats when we had to switch! We put her matress on the floor, and after 2 weeks or so we put her mattress into her new bedframe. That is about how long it took until she stayed on the mattress all night without rolling off.
What works for us is she likes the hallway light on outside her room, and I crack her bedroom door. When she is asleep, I close her bedroom door, and since she cannot open the door herself, (not yet anyway) I have the peace of mind knowing that she is safe and not getting into anything, and if she cries, I can definitely hear her from our room even with the door closed. Good luck, the transition isnt as terrifying as it seems like it will be!