You first want to attach the V shaped greeble to the top of the shin guards.  This is done by drilling two holes at the top of the guard and using bolts to bolt on the resin cast greeble.  There are two brass inserts which are molded into the greeble.  Be very carefull and make sure that your holes line up with these inserts and it will be straight.  Use paper to make yourself a template.

The first thing to do is to wrap the straps around your boot with the boot on your foot.  If needed you can trim the straps.  Make sure to leave enough room for the strap to go through the loops on the back of the guard.

Drill holes in the end of the straps as shown and then put the straps through the loops on the back of the shin guard and use a zip tie to secure them in a loop.