Set your carpet down pile up.
Edge finish carpet.
If you are using the staple gun plate idea you would put your metal plate under the carpet and staple down the edge.
Vacuum the subfloor to remove all dirt and grit.
This is going to be the most basic method and many installers like to do it this way.
One of the methods that you can use to finish off the edge of a piece of carpet is to simply attach it to a tack strip.
Staple along the edge.
Start from the back side applying the tape where the carpet edge meets the finishing raw carpet edges.
I would say glue hot glue or a marine glue.
Binding is typically the easiest and least expensive method of finishing a carpet edge.
Cut any protruding edges straight or to the shape you want your rug.
The stuff mentioned above is for fabric the fray check and stop thread i don t think it will hold up if it gets wet.
Check straightness of the remnant edge with the measuring tape and marker marking on the back side of the rug any areas that need to be trimmed with scissors.
Place your carpet face down on your work surface.
Pull the edge of the carpet back 1 to 2 feet so you can see the underlying subfloor which may be concrete or plywood.
Binding the edge of a carpet involves wrapping a strip of fabric which is generally made from either polyester or cotton around the edge of the carpet and stitching it in place.
Place the cloth along the edge on top of the pile so the edge of the pile and the edge of the cloth are together.
This is done by a carpet binding machine.