The verb put on in the Greek text is in the Aorist 1 tense, which means that is done once some time in the past and never repeated again.  This is consistent with many things of this nature that were done by Christ and completed in the past on the cross.  Also, this is consistent with the appropriation of these things completed in us at our Spirit birthing sometime in the past.  Paul is really declaring that we once then "put on the whole armor of God" (Eph. 6:11). The putting on of the whole armor of God was done by God's part once for us at our Spirit birthing. However, since our mind was not fully renewed at salvation, we may not have been yet taught of the Spirit of what was once then completed at that time. First, our mind has to be renewed to the truth that we have all of Christ's empowerment, might, and strength within us. Second, with His renewed mind in us, we allow that truth to be expressed in and through us with a conscious choice, as we once then put on the whole armor of God at our salvation.

Some teach to put on the whole armor of God at the start of every day, repeating all of the armor pieces that they put on. That is simply mental gymnastics and is error.  That is you trying to do something, that has already once then been completed and done at the cross by Christ and fully appropriated to you at the Spirit birthing.  Every piece of the armor is the character and nature of Christ, and was once then put on at Salvation by God when we received Christ.  Doing those mental gymnastics may make us feel better, but we are still opening ourselves up to Satan, subjectively trusting in ourselves doing these things, rather than in the truth and reality of the finished and done work of the cross.