how does one upgrade from 4.8 to 4.9

[stormjumper]

hi everyone,

I'm running FreeBSD 4.8 at the moment, just wondering if someone can point
me to a relevant web-page take explains the process of upgrading to a
different version clearly.

Is there an issue if i "skip" versions, say from 4.4 to 4.9? or 4.8 to 5.2,
the RELEASE issues notwithstanding?

I did browse thru the FreeBSD handbook, but may have missed an entry, cos i
didn't see a section on upgrading from version to version.

Thanks.