Hi..
If your D430 has a core 2 duo processor it should be able to run os x lion. I'm not sure if you can just upgrade (haven't really bump into someone or article on upgrading) but for me i prefer a fresh install. You'll need to transfer the Lion USB Installer to another usb (e.g. using latest xfail), install bootpack and chameleon and run the installer. After lion is installed, you'll need to install EDP, rebuild you mkext and with good luck boot into an all new OS X lion. Well, that's how to do it in general. Check out the wiki for details.
Cheers!