Use copper nails. They're more expensive which may be why your contractor suggested galvanised. Make sure you use the right ones or else they'll be back up there in a few years time fixing it.
Suggest they go to Screwfix or use these...
Hi Max!
To start with I'd focus on the fact you're female! In my area there are a few lady plumbers, gardeners and DIYers and they openly market that fact - and they seem to be doing very well, positive sexism or not! Age won't matter here I don't think, just confidence, competence and being...
Mine have lasted ages - mainly as I've only used them once!
Not quite the craftsman I had hoped to be.
I know Toolstation will do some cheap ones, or on eBay. Also try Tradefix Direct as all their stuff seems dirt cheap.
http://www.tradefixdirect.com/hand-tools
:D