A bit of Wiring 101

Something I've noticed with using those kind of crimps is the tip of those crimping pliers have kind of a flat spot to them and you can put the terminal end flares there and get them started in their bend towards each other of course not too much but just a little tiny bit and sometimes I come just a little bit flared outwards away from each other so when you do put them in the pliers they start curling and towards each other easier but again don't get carried away and get them really pointing at each other yet till you get the wire in there.. and also I've used the flat spot of the tool on the end once they're done to sometimes if they don't curl over tight enough to just crimp them down flat a little bit more but again this is a finesse thing...
I've dealt with a lot of American Auto wire catch and they always come with a little packet of connectors for practice and it says it right there on the pack.... Well using them for practice try not to use them all if you don't have to because you'll find no matter how good you are you'll always screw one up and be glad you had an a spare...