I would let the pro at the dealer handle it if you're not sure what you are doing.
Just take off the bumper and give it to the repair guy, or have them take it off.
But for the best results on dr colorchip, here is what I do.
You should really have a paint meter to know how much clear you have to work with!
Tape around the chip and start filling in the chip.
Layer a couple of layers to make sure it's filled all the way above the regular paint.
Let it harden for a day or so (depending on weather).
Start wet sanding it down with 2000/3000 on a good block, within the taped area only.
Wipe downs with some IPA to check whether you've leveled it.
Be careful to not put too much pressure on it while sanding, you don't want to sand through your clear.
Once it's all smooth, make sure to finish with 3000 and switch to some good polish and a DA or rotary. (I usually use a Flex with yellow or orange UberPad and M105 for this)
Then follow up with a finishing polish and a finishing pad. (Here my go to is M205 on a green/blue pad)
That should do it..
