Please could you assist me with details complete instructions on installing my Glacier Bay pull down handle faucet

They aren't in the box?

If you don't have them, go to Home Depot and look at the one with the faucet.

Go to the home depot web site and find your faucet VIA model number and find the SPECIFICATION or INSTALLATION instructions and click on that link...should show you everything you need to do to install the faucet.

Here is an example faucet page: MOEN Benton Single-Handle Pull-Down Sprayer Kitchen Faucet in Spot Resist Stainless featuring Reflex-87211SRS at The Home Depot

You'll find the install/specs. for this faucet about 1/2 way down the page under PRODUCT OVERVIEW.

If you have the model number you should be able to find the proper page for you.

Good luck!

Mark