Hi Sue,
I’m a beginner myself (just got my pheromones last week), so I don’t have very specific recommendations for you. Anyway, greetings from another Dubliner (although I’m in Poland right now).
For me also, it takes a lot of effort to make new friends, and I feel that I don’t have the ‘charisma’ that some other people have. I’ve gotten rather comfortable with this fate, and don’t often struggle against it, but discovering pheromones has given me quite a shake! I now see that there’s something that can be done about these problems… although it takes a bit of resolve from the inside too, not just using these magic potions.
I’ll specifically back up the recommendations of Instant Openness. For me, the self-effects have been subtle but amazing - a confidence in speaking, and a confidence in what I’ve said, that helps undermine a lot of my bad social habits. I’ve noticed effects on others, too (I have more trouble seeing other-effects, because of my introversion), so … it seems I’m being helped both inside and out to become more sociable. I comment on these effects in my journal, although it’s not the most exciting read 
The only thing is that Instant Openness isn’t available in a to-go bottle. Still, thanks to the weak dollar, it’s not so expensive (€26).
I have lots of other pheromones, but I’m testing them methodically to identify their individual effects, so I don’t know much about the other yet.
Lots of luck with your experimenting!