Base Studs X-acto knife or leather rotary punch Screwdriver Ruler Pen
Step 1:  Choose a base and clasp method using the tutorials on the Collars page.
Step 2:  Turn your material so that the back side is facing upwards.  Use a ruler to draw a line lengthwise through the center of the base so that you can position your items evenly. Decide how far apart you would like your items to be (I usually place mine at 1/2").  Mark tics along the center line where your studs (or other decorations) will be placed.  You can do this freehand or with a ruler.
Step 3:  Remember those tic marks?  They indicate where your item will be placed. Studs have prongs on either side of the metal.  This means  you will have to position your stud prongs equally distant from the tic marks.  It does not need to be exact; just use good judgment.  When you are happy with where your stud is, press it firmly into the material.  This will leave two indentations that will be your cutting guide.
Note: You can use either an X-acto knife or a leather rotary punch to create slits for your stud prongs. Some belts are too thick to be pierced by an X-acto knife, in which case the leather rotary punch should be used.
Step 4:  If using an X-acto knife, cut a small slit in the material over both indents.  If using a leather rotary punch, adjust the punch to the smallest setting and punch over both indents.

Step 5: Turn your material over so the top is facing you.  Fit the stud prongs into the slits or holes, and press the stud down firmly.
Step 6: You will notice that the stud prongs are now sticking through to the underside of your material.
Step 7: Use the flat head of a screwdriver to press the prongs firmly down....
....and you first stud is complete!
Step 8:  Repeat steps 4 through 7 for each stud until all of your studs have been placed.
Step 9: If your collar involves studs or jewels, follow necessary tutorials until collar is complete!
Attaching studs and gems first is a good idea so that you hand is not hindered by the long spikes. Be extremely careful when using an X-acto knife; they are very sharp and are best used with adult supervision if you are a young teenager.  It is always a good idea to use a cutting mat designed specifically for X-acto knives to avoid damaging surfaces underneath.