A good CAT5 termination Provides a proper wire crimp, a wire insulation strain relief crimp and a cable strain relief crimp. Also important, is not unwinding the wires more than necessary, maintaining the twists as far as possible is important, but don't let it stop you from inserting the wires as far as possible.  

*Strip the cables Jacket back one full inch.
*Untwist the wires back to within 1/8" of the jacket.
*Arrange the wires in the order in which you want to crimp them.
*Grasp the wires firmly, between your thumb and forefinger, flatten them, and even wiggle them a bit, to take out the curliness, (concentrate your efforts on the bottom 1/2") the wires must lay flat and together, aligned as close as possible.
*While holding the wires firmly, cut off the wires 1/2" from the cables jacket (Cut the wires with some sharp wire strippers or even high quality scissors, avoid wire cutters that flatten the ends of the wires insulating material, this makes stuffing the wires very difficult.)
* Stuff the wires into the RJ-12 (three pair) connector, making sure the wires stay lined up. * The wires should reach the end of the little tube they are in, if possible, or at least past the farthest point of the Gold Plated teeth above it, which will terminate it.
* The jacket should go even with the end of the first indent, if possible, it's a strain relief for the cable.
*Insert it into the crimping tool, and Crimp it! All of this is very dependant on the tools you are using, the connectors you are using, and the cable you are using.   Make sure you have a solid connection.