1. I would not, at the moment build my own computer as I am not yet  fully acquainted with the computer components and I feel I would need more knowledge to do so. However, If I had to purchase a computer with a low budget or had to tailor a computer to very specific specifications I would strongly consider building my own computer.
2.The advantages of building your own computer are that it is often cheaper and the computer can be built exactly how you want it. The disadvantages of building one's own computer are that it is far more time-consuming than buying one and if something goes wrong there is no-one you can turn to for help.
For my friends and family I would recommend building their own computers if they were well-acquainted with computer technology.