at first you should make a complete backup of all your files and database, because most of the vb3 addons won't work in vb4/5. also you will lose your style.
make sure your server supports the php- and mysql-version of your new software. next step is to deactivate all your addons, upload the new files and run the upgradescript.
then update all your addons. if there is no update for some of them, deinstall them and search for similar ones.
kinda easy when you have done it a couple of times, but it can be a big procedure when you have a very modified forum.
[ot]ps: i strongly recommend vb4 instead of 5[/ot]
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