Hi sjleitner!
I live on Mahe (my mum is Seychellois). My friends and I actually go to Praslin when we need that 'island vacation' getaway! I absolutely love Praslin, but if you're moving from a big city or a big town, adaptation might be very, very difficult.
It's a quiet place, there isn't a lot of things to do. During weekdays, stores close VERY early...sometimes even by 6pm! But there are lots of expatriates and tourists on the island so when you get time off work you'll be able to hangout with people who are in the same boat (i.e. foreigners of the place).
Seychellois are always up for hangouts and having fun so don't hesitate to mingle with locals. Although I would advise you to not be too generous. The Seychellois on Praslin are generally very friendly. But like any other country, there are nice people and then there are those you need to avoid.