I'm no expert, but I'd suggest going west 528 to Universal Boulevard. Go north (turn right) on Universal Boulevard. After crossing I-4, turn left at the next light (Hollywood Way). RPR will be coming up on your left.
For PBH, follow the same directions until you get to Hollywood Way, instead of turning left, stay on Universal Boulevard. A few block from there, you'll come across the PBH entrance on the right side of Universal Boulevard, directly across from the HRH entrance.
Another option is to take 528 west it I-4. Take I-4 north to Universal Boulevard. Turn left onto Universal Boulevard and follow my previous directions from there. The reason that I have this as the second option is because my first way avoids heavy traffic.
Please note that 528 is a toll road and there are 2 toll booths along it.