For a QUICK SIMPLE black frame, i just judge with the cropping tool, then invert it then colour that section in with black.
For nicer black frames etc. go to mikes framer as said before...once you download it, open up the actions part, then load that tool, click on it and press play - it should do the rest for you.
Learning photoshop is hard...
My work wanted a graphic designer...so they asked me because i was interested...i sat down with photoshop LE 5.0 a tutorial book, and i worked on it for 6mths straight 8am-5pm. And still i am learning new things with the upgrades. But now i do logo's, photo retouching, extensive photo work, poster work, brochures...and MUCH MUCH MORE...
I suggest to really involve yourself in photoshop if you want to learn it the right way - it's going to take a long time trust me...it's a hard program to use, and you NEED patience (Something i dont have but HAD to have for works sake). Maybe 6mths is a long time to learn it - but i mean i learnt it from the ground up...basics to now advanced.
But at the end of the day - the program is the best i have ever used, and its the ONLY one i would recommend, the pro's use it so it's obviously the best out there. Dont give up...take breaks when necessary and just do your tutorials day in and day out. It helps!
Del