Don't be scared to learn SharePoint. It may seem like a difficult task at first, but if you take it one step at a time you should be ok. In fact, SharePoint is just a (really big) asp.net web application, so all your existing skills come in handy.
Also the fact that MS finally put some good quality project templates for SharePoint development in Visual Studio 2010 makes the learning curve less steep.
There are also some good books available to get you started. If the company wants you to learn SharePoint, I suppose they would be happy to pay the bill for those. :-)
