Normally you need to invite someone and form a raid to get into a raid instance that you want to do solo, I found a trick to make a raid WITHOUT real action needed from any players.
1. Invite ANYONE into a group (they can be AFK while you doing this)
!! They are not allowed to accept or decline the invite or you have to be fast !!
2. Rightclick you character portrait and click "raid"
3. Get into the instance without any real help from other players.
Hope this helps anyone![]()