how hard is it to make your own UTP cabling and how easy is it to mess up the cable? can a faulty cable be hazardess or harmful if not constructed properly

how hard is it to make your own UTP cabling and how easy is it to mess up the cable? can a faulty cable be hazardess or harmful if not constructed properly

Pretty easy to make. here are some instructions and here is a RJ45 crimper.

Unless you're doing something like power over ethernet, I don't think anything would get too hosed up if you get something switched around, but data transfer would most assuredly suffer.

commented: nice link +22

Easy to make. Use a crimper. Do your research (e.g when to useSolid cable vs Stranded cable [and make sure you get the correct connectors for your chosen type] as well as cable specs e.g CAT5 vs Cat5e vs CAT6). Do a few practice runs beforehand. Your first few will be rubbish.

A bad cable could conceivably damage your network card etc....

That howto above is good. I think there is another one on WikiHow.