I also recently bought one. Did the same...took it home and hosed it out with gunscrubber. Oiled it and waited to shoot it.
When I did, I was pleasantly suprised. I thought it would have a bit more kick for such a small and light gun. It is actually pleasant to shoot. After a few hundred rounds (without a single problem) I am finally getting used to the Heine sights. It is different than the standard 3 dot or frame sights. Just put that front sight right up there on what you want to hit and align the rear end.