Don't fear the collar - A tutorial on tying on collared jigs
Most tyers prefer to tie on jigs without collars, but that doesn't mean you can't make a decent tie on a collared jighead. I tied up some today and took pictures as I went along. Hope this helps a few newbies.

Our starter jig, a 1/16 ounce. As you can see, this jig has a collar with a barb for holding plastics. There are three things you can do with the barb, and all have their advantages and disadvantages. You can flatten the barb, cut it off or remove the collar entirely. Many collared leadheads have up to half the weight of the jig in the collar, so removing the collar entirely will drastically change the weight of the head. You may find your 1/16 ounce head is suddenly a 1/24 ounce or 1/32 ounce. Flattening the barb doesn't change the weight of the jig head, but it can leave an unsightly bulge in the finished jig. I prefer cutting off the barb. It changes the weight slightly, but leaves a nice flat surface.

Pinch the barb near the base with a set of needlenose pliers. Twist and the barb will pop right off.

Start your thread wraps behind the collar. Go back to slightly behind the point, then wrap back to the end of the collar. Since you don't have as much thread as a collarless head, secure it with some clear nail polish.

Tie in your tail material behind the collar. Add some flash if you like.

Now we bring the thread up to the area just behind the part of the head that will be visible.

Strip the chenille down to the central fibers, but only on the part that will lay over the collar. This pic turned out a little blurry, but hopefully you can see what I mean.

Tie the bare thread in just behind the bulge and wrap your thread over the chenille until you get to the end of the body.

Wrap your thread back to the bulge and wrap over with the chenille, then tie off as normal and you're done!
Don't worry, catch crappie.