I have the usb version and its very hard to get it to lock on inside my house which happens to be at the top of a hill and hence can see in most directions clearly.
The red flashing led means its trying to lock on. It will go solid red when it succeeds.
I have been using a bit of software called visualgps and its quite useful as you can see all the data coming in and the movement of the satellites. What it showed was that the gps device despite being able to see at some points up to 11 satellites, it wasn't getting a complete broadcast from at least three. What, you see is the satellites blinking on and off on the radar scope. Once its locked onto at least 3 then you'll find that they stay put on the radar and turn red. Once its locked onto 3 then the complete broadcast isn't required and hence it stays locked even when only getting partial signals from each satellite
I'm afraid its a trip outside for you and that may not be just to your driveway. Mine doesn't lock all the time outside my house. Depends on what time of day it is i.e which satellites are where If I go to the park nearby its locks in about a minute and stays locked when I park up on the driveway.