Is it possible to crimp category 6 without a special guide insert?

Question

Cables and wires

Is it possible to crimp category 6a without a special guide insert? For the first time I am crimping a cable of the sixth category, in the fifth there were no inserts into which you first need to insert wires so that it is convenient to get into RJ-45.
I can't even find where to buy them, but I have no idea how to run a cable without them.