How many lashes do you put in when doing a half set or corners please in relation to full set ?

Are you talking about individual/cluster lashes (temporary) or lash extensions (semi permanent)?

Lash extensions

I don't offer these, but i'd imagine the amount you use will vary by client. And i suppose you use what you need to, to create the look/effect you want. I don't think anyone can give you a definitive answer to that.

Just trial and error i suppose.

Sorry I know i haven't helped much x