Hello I will help you with your question,
If you have the plastic rock shield off this is half the battle.
Remove the negative battery cable
Remove the two large bolts from the starter housing and catch any shims that may be in the starter to block mating surface.
The starter will come down at this point and you have to support it while you remove the large battery cable and the small switch wire from their terminals on the starter.
Reinstall without the shim and without the plastic rock shield.
Try the starter if it grinds install the shim and try again.
You may need more than one shim or you may have to shim only one bolt. This is a try and see situatiuon.
Those are my instructions, these are GMs
When removing starter, note if any shims are used between the starter and mounting surface. If shims are found, reinstall in original locations. If starter is noisy during cranking, remove one .015 inch double shim or add one .015 inch single shim to the outer bolt. If starter makes a high pitched whine after engine start, add .015 inch double shims until noise ceases.
Let me know if you have further questions about this
Then you do not have the plastic shield out. Remove the two small 10 mm bolts. These have to be loosened with a open end wrench and they take forever to get loose enough to pry thr plastic piece out of the way.
Let me look and see if I can find a picture of the shield. I curse the engineer everytime I have to do one of these
Sorry there are no pictures, the shield is held by two blots that you can get to to remove and one you have to loosen as much as possible then pry the shield out of the way. If you can clean the area with some spray brakeclean you will be able to see that shield. The bolts are removed with a gear wrench or an open end wrench . I am going to OPT OUT of your question and maybe another expert can give you clearer direction than it seems I am able to.
Don't reply or it will delay another expert from answering you
Sorry I was not much help to you