Hi Undecided,
A few words of encouragement: the salsa scene in Cardiff is very friendly.
I started on my own and in a way I found it the best way. You don’t need a partner, it’s just a case of turn up on the night. The classes are structured so that you change partners regularly, this way you get to meet lots of new people.
A lot of students tend to go to Cuba, therefore the age range is generally the younger generation whereas at other venues it’s more of a mixed range of ages.
The info on the front page of this website is a bit out of date. The classes are split into two levels and it’s now £4 for one class or £5 for both classes. I would advise you not to do both classes until you have been to about 5 or 6 beginners classes.
Certainly don’t hang around outside, just pop in and maybe just have a look at how the class is run, you’ll soon see that everyone is having fun which will just make you want to join in, but make sure you pay at the till before doing so.
Good luck, have fun!