I grabbed the buttons and got to work. Now, I know most of you have sewn a million buttons on things; so have I in my lifetime. But there is a difference to sewing buttons on to a knitted item as opposed to most woven fabric.
With these buttons, using regular thread would have taken forever, so I split the 4 ply worsted weight yarn I used into two sets of two ply and threaded a small yarn needle.
I then doubled the yarn over and tied a knot at the end. This is really important for an upcoming step.
If you line up the two sides with the button hole on top, you can mark the placement of the button by sticking your needle straight into button hole.
Holding the needle, pull back the buttonhole side and look at the placement of the needle. This is where you want your button to be centered.
One difficulty with sewing into knitted fabric is that there are so many holes! So one of the tricks that I learned many years ago is: When you go up and then down through the button's holes for the first time slip the needle through the loop formed by the two legs of the yarn. This will anchor the end of the yarn with the button itself so that it won't come loose.
It only takes a few passes with the yarn to fill up the big holes in the button. Try sewing on 7 of these with plain thread!
Happy Knitting!