First of all there are no "minor power chords". It is the nature of power chords that they don't have a third, which is what determines what is a Major and Minor chord. Power chords are just made up of 2 notes (called a diad) and can be used in place of major and minor chords.

I have heard people, who struggled with Barr Chords, that they learned much faster if they grabbed the chord part first and then added the Barr. It has been a long time since I struggled with barr chords, but I remember that it took a long time before I could reliably play them. I also remember that Barr Chords really opened up the guitar in many ways.

Hang in there! It does eventually come together. But not without a lot of practice. This is a perfect example where patient, persistant, practice pays dividends. You really do want to be able to play Barr Chords. They are curcial to playing many songs and they also play a big part in transposing songs to other keys. They make you work to learn them, but they really open the posiblities of what a guitar can do. Otherwise you are stuck in a cowboy chord world that is very limited.

I would also advise that you listen to the recommendations to feel free to take a break when ever you get really frustrated. Some times this is all that is needed. This is a new skill you are learning and it becomes useful in varrious ways for varrious people.

patient, persistant, practice.....