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Should be a very simple install. Just remember after the installation to go to disk management to allocate and format the new drive.

Service manual has the installation procedure.  The second drive needs a bracket that likely won't be present in the system -- if it's not there, you will need to contact Dell Spare Parts to order it.

https://www.dell.com/support/home/en-us/product-support/product/xps-15-9510-laptop/docs

Carefully check the specs on the drive you ordered -- it's better to get one without the heatsink included.  These are often not easy to remove (and drives with heatsinks are generally designed for desktop systems -- not notebooks, where they won't fit).

I appreciate your reply.  I have studied the service manual and written procedures for myself.  I was looking to see if anyone else has installed a second hard drive and it they had and problems or suggestions.

Thanks.  I have read the service many and it looks to be very helpful.  I saw that the existing hard drive has a heat sink on it.  I have ordered the heat sink for slot 2 from Amazon.

As others have stated, get a drive without a heatsink and using this one: https://www.amazon.com/Second-Heatsink-Thermal-Latitude-Precision/dp/B08M3H1ZHW/

Dock, thanks for the advice!  Funny you should suggest the heatsink on Amazon.  That is the exact heatsink I ordered.  My laptop is actually for my daughter and is supposed to be delivered this Tuesday (March 8, 2022).  I plan to add a post after I have completed the installation.