Just throwing out there - the learning curve is HUGE... for buying parts.
Once you understand how the parts work in relation to each other, and how they name parts (older generations of video cards in relation to newer ones still confuse me), it becomes much, much easier.
The actual building of a computer though? Bloody easy. Think Legos for adults, but you get youtube videos walking you through exactly what to do!
That being said, the hardest part isn't going to be figuring out what parts do what, or how the parts fit together... it's what parts aren't going to be a waste of money. For example:
An ivy bridge (the successor architecture to sandy bridge) i5 is not only going to be better in many situations than a sandy bridge i7, but it's better for gaming than an ivy bridge i7, because the i7 is the same as an i5, but with hyperthreading. That means that spending the extra $100 on an i7 is a waste of money for basically any gamer, because it doesn't give any benefit.
Here's a rough outline of what the ideal gaming PC is - you can get better parts, but spending $600 more for a 10% benefit doesn't work with most gamers.
i5-3570k (The best of the ivy bridge i5's, and the current best gaming chip.)
An aftermarket heatsink if you're overclocking. (But not a water cooling heatsink unless it's a real one.)
8 GB of 1600MHz ram. (There's NO point to getting more ram, and intel doesn't see hardly any benefit from faster ram than this.)
A quality 550w power supply. (The important thing here is quality - a good PSU will put out 550w forever, where as a bad PSU might be rated for 1050w, and never give more than 600w.) [550w is also plenty for basically any modern system, or 750w if you want two graphics cards in the future.]
A case of your choosing. This is entirely personal, but a lot of us spend about $100 on this. More doesn't really see much benefit, and while less gets better budget cases, a $40 case isn't going to have as much thought put into airflow, it's not going to be as quiet, and it's more likely to have machining errors.
A reliable 128GB SSD for windows and often used programs, and a 1TB drive for data and game storage.
A graphics card of your choosing. Those of us who can afford it go with a 7970 or 670 - the more expensive cards give very little real-world benefit. (The 690, for example, does worse with three monitors than two of the right kind of 670s do.)