Just apply. Chances are that a company is willing to talk with you solely on the fact that you're interested and self-taught. There's so few jobs in Haskell compared to the rest of the market and so few candidates with the experience that you probably already have a leg up. My team works primarily in Erlang and we normally willing to interview people with no Erlang experience but a desire to learn. I can't imagine a Haskell shop being any different.