I need instructions on how to replace the tumbler & ignition switch on a 01 Saturn SC1.?

I need to replace my tumbler and ignition switch on an 01 Saturn SC1, in order to save money I'd like to do it myself. Has anyone done this? Is it hard? Should I just take it to someone to replace? I don't have the Haynes Manual, so I'd really appreciate any instructions, hints, tips that could help me. Thanks.