How to crimp a ferrules(end sleeve)without a crimper?
Based on experience trying myself: Just get the cheapest ferrule crimp tool you can find.

It will be better than trying to use pliers, which doesn't really make a crimp because it squashes them flat and they can easily open up from that. Flattened ferrules are also very wide and don't fit in screw terminals that would otherwise hold that gauge of wire.