Apple’s MagSafe connector is nifty. It’s held on by magnets so it’s a lot harder to ruin both the connector and notebook if the power cord gets jerked-out unexpectedly. We dug up a DIY guide on how to convert your PC’s non-MagSafe adaptor into an ugly, but still working, clone.
I would say that there is a good possibility that you could wreck your notebook if you mess this up. The instructions are good and pics are aplenty, but still be careful. It might be wise to try this one someone else’s notebook before you attempt yours. That’s what I would do.