Are you on volumes or partitions for v10? Which version are you planning on upgrading to?
If you're already on volumes the upgrade to v11 or a step upgrade to a later version of v10 is dead easy. You can do it through the GUI by installing to a second slot. Your original v10 installation is preserved so you can always boot back to it.
There have been some issues upgrading to v11 particularly with APM and WAM enabled. If after upgrading the config fails to load, run '/usr/libexec/bigpipe daol', resolve any config file issues and then run '/usr/libexec/bigpipe daol' again.
The release notes have more complete info. Holler if you have more specific questions.
Aaron