There are two ways I've found to to do this, either copy and paste from the pdf into a word document where you can control the size of the label and get 4 on an A4 page, or change the size in the PDF and get a couple on the page by "double printing"

Option 1

make sure you have a clean word doc open. 

When the label is open in PDF,  click on the edit menu (in the PDF) and choose "take a snapshot"

With left click held down, draw around the label as it appears in the PDF, then let left click go.  You'll get a snapshot.

Now right click anywhere in your word doc and choose paste.  You'll get your label reproduced and you can re-size and move it to wherever you want on the page.

Do this for another 3 labels to get 4 on a page, or do two bigger labels on the page in landscape view.  Print

Option 2

In the print dialogue from the PDF you will see an option "custom size"

I resize to 96% and print the label

Then I turn the paper with the printed label around and use it again printing the next label at 96% at the opposite end of the same page.

THis method only saves half a page, but I use the left over pieces of paper for notes and when there are too many I just rip them up for the compost.

And the custom size is good if you want to print a bigger label - just make the label 130% or whatever works to fill a page.

I tend to use option 2 as it is a cleaner print on my old printer.

Hope this helps