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Right after college I was a Commercial Plumber for a large Mechanical Company so I could stay in my college town for a bit longer. I learned a ton while having that job, and feel that some sort of trade job should be a requirement prior to going to college, as I would have studied significantly harder after busting my a$$ for a year as a plumber.
Now to answer your question. If you have never done plumbing before, its not un-doable. Just make sure you know the codes, etc. Buy some copper pipe, solder and a torch, and practice. It doesn't sound like you have a large house, but even a small leak can cause huge problems. I had a friend with a 3 bedroom, 2 bath that was built in the 80's using polybutelene (plastic piping) that was corroding horribly. As a favor I re-plumbed his entire house. I had decent access to everything, but it still took me 3 days of solid work. I replaced everything, from where the water main came into his house to each sink, toilet, tub, washer, you name it. It was a ALOT of work, and I knew what I was doing.....
I do not mean to discourage you, but if I was going to do it, I would replace everything, not just the horizontal pipes. Just replace one line at a time, so you don't get the hot and cold mixed up. Unlike electricity and gas, its pretty hard to kill yourself doing plumbing, smile. If your house is a one story and you have a crawl space like you mentioned, then you should be able to see where all the lines run. You will need new valves for each sink and the toilet, and also most likely a new outside faucet, as I am sure the one you have is pretty old.
Feel free to ask me any other questions.
Bill
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