[T-Mobile, Samsung Galaxy SIII] lordazoroth:
I whole-heartily agree, I was a freshman noob August 1st this year, by August 4th I was flashing like a pro. Left and right, ROMs, Kernels, Modifying system files, you name it. I wanted to streamline my phone and future proof it somewhat by overclocking. I spent 3 days researching and educating myself, finding the best ROMs, weighing pros and cons, and when it came time to flash, I was on my PC all day making sure whatever I did wouldn't brick me. I carefully analyzed and learned about virtually all methods of flashing by watching tons of videos and reading a bunch of tutorials by several sources. I MD5 checksum'd every zip to be flashed on my phone using an app (to ensure download and transfer was successful). I must have verified that the files I was preparing to flash were indeed for my device make and model about a dozen times before ever touching a button. When I went to flash over my first custom Kernel (even though I had already flashed 2 custom ROMs shortly before that), on that last button my hands were literally shaking, I could not afford a second Galaxy S III. Everything went beautifully, all of my careful planning and hours of invested research payed off. I had done everything right and was rewarded with better battery life (about +50% on heavy load and +500% on idle) and performance (+25%).

My girlfriend also has a Galaxy s3 and she wanted the same performance I was getting. I flashed the exact same software to her device I had to mine, no changes.

Total time invested in flash on my device: 36 hours, at least

Total time invested in flash on her device: 1 hour... if that

The bottom line is yes, if you're not willing to put forth the effort and educate yourself first, you probably shouldn't be doing this. There are guides and tutorials out there for noobs and I would recommend you go there first until you know your way around your device. That way at least you have a little experience on your belt before you start doing anything too advanced (I did this when I was rooting my device for the first time).

As a side note, I know there are a lot of people out there worried about doing anything that could potentially brick their device. That is always a real possibility, I'm not going to lie to you, it happens more often than you think. However in just about every case of bricking you'll ever hear about, it's usually someone flashing something they're not suppose to, like a ROM designed for a different make and model of device, or something experimental that wasn't ready yet. Do all your homework (from multiple corroborating sources) before you undergo a flash and as long as you do everything "by the book" (so to speak) and don't rush through things by being lazy, you should be fine. Some even flash nightlies (yeah they're called that for a reason, updated versions of the ROM they currently have) EVERY NIGHT!!! In the end when you have an android device, you have an open source platform at your fingertips and you should take advantage of that, it would be a waste not to. If not, your next device might as well be an iPhone. They're great for noobs and as long as you're ok drinking whatever punch Apple gives you, they're pretty much impossible to brick since you can't do a whole lot with them. Apple will be happy to take your money and stiff you with closed source for it. :)