who to use to replace front door?

Hello,

We are looking to replace our front door -- the frame may also need to be replaced as one of the reasons we are replacing the door is that it keeps getting stuck (plus other issues).  We are planning on getting our new door from Ashby Lumber, but they said that we'll need to get a contractor to measure and then install the door when it gets here.  They have recommendations on their site, but many of them look like general contractors that would only take big jobs.  Any thought on what kind of contractor (or any recommendation of a specific person) who might do this type of work?  We would prefer someone who is licensed.

Thank you!