How to 'root' (or gain root access to) a Sony Ericsson Xperia X8 with Android 2.1-update1?

I have a Sony Ericsson Xperia X8 with Android 2.1-update1 and I need a quick easy way to get root access so I can boot it through a custom ROM me and a friend have been working on (the custom ROM is like Gingerbread (Android 2.3), but with a different UI so that it's compatible with my phone)