Adafruit has a great LCD+Keypad kit for the Raspberry Pi with excellent assembly instructions and a nice Python library. I just had to order one along with my first Raspberry Pi.
After it arrived I picked up a 25W Radioshack Pro-Line soldering iron, some 60/40 rosin-core solder and got to work. Luckily I had an old, dead iPod mini to tear apart and practice on. After soldering the first dozen points I felt like I was getting the hang of it. All-in-all I think it came out pretty well.