I'm actually not upgrading the card for LR or PS. I bought a new monitor that DVI and my current card only has hdmi and vga.
I've never installed a video card before. From some tutorials online, it looks pretty simple. Am I right in thinking this is something I can handle?

I was also thinking of upgrading to usb 3.0 while I have the case open. Is that a good idea to try myself or am I asking for failure?
Oh, and while I'm asking stupid questions, a lot of the cards I'm looking at talk about the computer's power supply. How can I check to see if what my current system has is adequate?