They're fairly easy to install.

A Graphics Card was one of the first parts I ever changed on my own, and it went really smoothly.
If you're very worried though, buy one from newegg/amazon/wherever online, and take it to your local PC store and get a quote from them.

Most places such as PC World, as well as being stupidly overpriced, will usually install a part for you.

Geek squad will do it and charge you a good $50-100 or so for doing something a 10 year old can do

Well then I guess I could try on my own and just look up some guides or something

There will almost certainly be a detailed video guide on how to remove and install specific cards. It's as easy putting Lego together, once you get to grips with it.

Usually you can install it yourself. However, if you have a really small case (like me with my last PC) or a retardedly xboxhueg graphics card (like me now) you may want to let professionals to it properly. My card right now was too big to fit with the hard drive bracket so I brought it to a store and they moved it all around and now everything fits perfectly and sits nice and tight. 20 bucks. Most IT/computer stores should be able to do that for you, just give them a call.

Intimidating as heck opening up your computer for the first time, like a surgeon holding a scalpel looking down at his patient's organs going "well, now what?" but once you figure out where to slot what, paying someone to do it feels like theft. Check out some guides, they're everywhere.

Yea that is exactly how I feel

Not the newest guide but the best by far from my quick google search.

click here

It is actually pretty damn easy. They usually slide in and out without applying too much pressure.

It's very easy. Do you have a graphics card in mind? Higher end cards require 1 or 2 additional connections from the PSU.

have you ever played with lego? it's basically the same

Anything that will let me run at more than 20 fps during dm fights

Just make sure you ground everything when you open up the case, that's probably the mistake most people make, though I have to admit that it's very easy. If all you're running really is tf2, you can probably go with a lower end card, especially if you don't already have a good PSU. If you just want a cheap card, I would suggest this for Radeon, this for nVidia, can probably run modern games on low-med settings, and will handle everything TF2 does on the GPU very well. TF2 hardly uses the GPU, so if you're getting really low frames it's probably your processor that's slowing you down. Can you post specs of your computer, or the model/model number? If it turns out you're running on a Pentium, no GPU in the world will run tf2 any better.

If your FPS is that bad, then it might be that no graphics card can save you.

What's your system specs at the moment?

Word of warning, TF2 is a very CPU limited game. Assuming you are already running dx8 max fps config you probably are going to be disappointed with a new video card purchase. (it doesn't mean you shouldn't do it, just don't expect a lot in source games if your CPU sucks). I upgraded from an 8800gt to a radeon 7850 and the fps difference was pretty negligible.

tunrs out you cant even install a video card on my comp the guys at geeksquad said something about it having microchips or some shit i was to pissed off to really listen im just gonna have to purchase a new computer

microchips?!

You may have a very old mainboard/laptop that doesn't have PCI-e ports, or has the older AGP ports. In that case you should consider a new build.

yea something about laptops parts being in my desktop because it wasnt built for games

aww that sucks man, good luck making a computer then :p