Yo !!!
Yes you can do this. This is pretty easy and I know there already another topic somewhere about this. But let me show you quickly how.
Setup yourself ... the leader
You need to recover one of those profiles to handle trinity combat behavior on your leader while you play with it.
http://www.thebuddyforum.com/demonbuddy-forum/demonbuddy-profiles/132380-trinity-compatible-combat-profiles.html
Inside the while statement you can add a wait timer. So the Profile will remain actif whatever the thing happen.
Run that profile while you play will allow you to play freely but still trinity can kick in sometime to destroy something or pickup another. Trinity too get boring ... waiting while you play!
Setup your follower
This is the most easiest part. Just run simplefollow.xml, than use your leader to invite your follower and lead the way.
The follower will follow and if he bug he will leave the game sometime and join back or just invite him again.
Hope this help. Obviously you will probably need 2 demonbuddy licence.
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