Hey
@peargrow, I'm in the uk and I'm sure there are others here too if you look through the outdoor forum. It's my first year trying autos outdoors but I have a bit of experience growing photoperiod plants gg style.
How a particular strain will perform and what it will yield when grown outdoors is hard to say because there are so many variables that can affect the outcome. There are some basic principles to adhere to, as highlighted in GreenSkell's opening post, and strains more likely to succeed, but outdoor growing is very much a case of trying things and seeing what works in your location.
With that in mind, do your research then just take the plunge. If you do a journal you'll get lots of advice and help should you need it. Good luck and go for it!