Believers have authority to challenge the dark powers, but it's conditional...
Ephesians tells us that we are to battle 'in the spirit' and in the 'heavenlies' NOT with flesh and blood (which partly explains why I have stopped entering the forums) but that we are to 'pray incessantly' i.e. whenever we are 'out there' be in direct contact with God, though His Holy Spirit.
1. So one needs to know that the Holy Spirit has affirmed that you should intercede, for if you venture into 'enemy territory' without 'support' you are at risk of giving the enemy authority to attack you.
Don't go unless you are in a 'Tank'!
2. A sparrow (curse) cannot alight without a perch. So before you enter the arena, get in spiritual shape.
3. Nobody is called to do spiritual warfare as THEIR full time ministry, we are ALL able to intervene/intercede in situations, but if it starts to be your main focus, get ready for trouble, because if you spend too much time in the enemy's camp, you are liable to pick up 'ticks', besides which being a sniper is more effective than charging the battlements daily.
4. Get prayer cover from other believers if you need to engage the enemy, like any soldier, you need backup and supply lines, and the power of fervent prayer is the backup and provision you need.
Maybe there's a hub here!