I have a mate who is totally useless with all things mechanical. A while ago he asked me if i thought he would be able to change the cam chain on his bike himself, i said you got no chance, he said why I've seen videos it doesn't look that difficult. My reply was because the week before when you topped up the 2 stroke oil on your brothers MTX125 you poured it in the coolant header tank and didn't know it was wrong until i pointed it out to you