courgettes under enviromesh?

Hi again,  Sorry to ask so many questions, but very new to all this and desperate to get some crops this year!  I have a cougette plant under envoromesh on my raised bed.  It is not flowering yet but almost there, the female flowers need to be fertalised right?  So I am assuming this will be a problem under enviromesh?  I really don't want to take it off as I have cabbages and cauliflower under it too, (cauliflower will probably not work as I don't think I planted it in deep enought, but he ho that is another subject )   Can I fertailise by hand?  Or do I have to remove the enviromesh completely for the courgette to produce any fruit?  If I can fertalise by hand do I break of a male flower and just touch it onto all the female flowers?  And how do I tell the difference between male and female?

Many thanks for all your help, much appreciated.
Juliet

Hi Juliet, never worry about asking too many questions, that is what this place is for!  As you have realised, the problem with covering courgettes is that they need to be pollinated, there isn't any need to cover them as once they are big enough the slugs don't really make any difference.  Is there anyway you could arrange the mesh so it covers your brassicas but not your courgette?  If that is too much of a job then you can hand polinate in the way that you suggested.  The female flowers are the ones with mini courgettes behind them and the male ones are the ones without the courgettes, just a thin stem.

why do they need hand pollinating? I've never heard of anyone having problems growing courgettes

Heard lots of problems with folks growing too many courgettes 

There is no such thing as too many questions. I always  learn from the posts of others and others ask what I as thinking as well .
As away 

It's a game int it, keeping stuff off the produce. Drives me mad at times