Dave,
I believe the T41's are pretty much the same as a T40, except for some of the inards. The HDD is pretty simple to remove.
Look on the bottom of the laptop, underneath where your right hand would rest on the wrist pad. There is a single screw that needs to come out. Once removed, the HDD should slide right out...with a little pulling maybe. It's a piece of cake. I've done the T40's several times.
Randy