Ten people will give you ten slightly different responses. The key is knowing how to identify the ROOT note to land on and structure around what chord you are in, but yes, the overall tonality of the pentatonic is the beauty of it all. Of course pretty soon, you are adding blue notes into it and you are using six or seven notes in a position and not just the five. Heck, some of the cats around here can play a whole song and make you cry using four notes in one position.

And then there is the switching between minor and major in the pentatonic. Not to mention all the formal scales…but it really isn’t all that overwhelming if you just take it slow.

Brian has lots of things here to help you through the root note thing until it all just sort of sticks with you.

Kevin,
All those chords are in the one key of Am. The A minor scale will fit over all those chords and, therefore the Am pentatonic, which is derived from the full A minor scale will fit. You can add the blue note, the flat five, which is not in the A minor scale, as a passing tone and it will sound good, also.
It is when you play a major blues using dominant chords, ie. A7, D7 and E7 that you are actually playing in three different keys, that you have more options. You can use the A minor pentatonic over all the chords or perhaps use A major pentatonic over the I chord, or use mixed major/minor pentatonic licks or switch scales/use chord tones over each of the chords.
John