I've flashed my SPL and my rom several times before. Getting close to 20 times I've flashed my rom and 5 times flashing my SPL and I've had little to no issues.

I've flashed my SPL and my rom several times before. Getting close to 20 times I've flashed my rom and 5 times flashing my SPL and I've had little to no issues. Follow the instructions to the T and nandroid backup and you should be okay.