Please let your mate know that most decent trades have been through this at some point.
With experience comes learning to read customers and realise when they are likely to turn out to be cunts and price your work accordingly, when I'm quoting for someone I suspect could behave in a way similar to this my prices rise VERY sharply.
Experience also teaches you to recognise patterns that are likely to lead to you fucking up, for example skipping lunch to "get the job done" is something I've learnt is a very bad idea.
Please let your mate know that most decent trades have been through this at some point.
With experience comes learning to read customers and realise when they are likely to turn out to be cunts and price your work accordingly, when I'm quoting for someone I suspect could behave in a way similar to this my prices rise VERY sharply.
Experience also teaches you to recognise patterns that are likely to lead to you fucking up, for example skipping lunch to "get the job done" is something I've learnt is a very bad idea.