I agree with the post about having about 2 inches of jacket removed. This makes sorting the conductors so much easier. Once you have the conductors arranged and flat cut the ends off at a slight angle, maybe 10-15 degrees. This allows you to then insert each conductor into it's "slot" one at a time. As each one is home then the next one is just starting to enter it's slot. Makes life much easier. Then make sure that all the conductors are visible in the end of the RJ45 before crimping. You may have to push on the cable a little to get the shortest conductor all the way in. I've found this results in fewer bad crimps.
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I agree with the post about having about 2 inches of jacket removed. This makes sorting the conductors so much easier. Once you have the conductors arranged and flat cut the ends off at a slight angle, maybe 10-15 degrees. This allows you to then insert each conductor into it's "slot" one at a time. As each one is home then the next one is just starting to enter it's slot. Makes life much easier. Then make sure that all the conductors are visible in the end of the RJ45 before crimping. You may have to push on the cable a little to get the shortest conductor all the way in. I've found this results in fewer bad crimps.