The filling of His Spirit comes by yielding to His control and by faith depending on His enablement.
You must be a witness before you can witness. The noun must proceed with the verb.
The disciples of our Lord witnessed first-hand the miracle of multiplication.
We should be with Him, building until the work is done and battling until the victory is won.
When we follow Christ, He will make us fishers of men. If we are not fishing for men, it is evidence that we are not following Christ.
There is only one requirement the Lord makes for our service to Him, and it is death to self.