Windage tray installation question

Hey all, I am installing a Mopar Performance windage tray in my 318. I know I have to replace the 2 and 4 main bolts. My question is, do I need to loosen the whole crank and then replace and tighten all of the bolts in sequence or can I just replace the main bolts that need to be replaced? Do I risk and any damage to the crank? Are there any other risks I need to be aware of?