Well it depends on how you define "easy". Since your just getting started and Im guessing dont know a whole lot about web design or development its probably gonna be hard to just get a job with a company and work from home. That being said, once you do know your stuff, I've found that its really a toss up as to whether you will be able to work from home or not. Since I work for myself as an independent contractor I prefer to work from home, but some clients that have contract work prefer me to be on site so that presumably they can monitor my hours, other clients are happy that I work from home as long as I get the job finished on time.
Average income is probably dependent on where you live. I live and work in San Diego,CA and will make about $50k US this year because of the economy. Last year I made $75k
PC Repair vs Web Design, Web Design wins hands down. I went to a vocational school about 8 years ago for PC repair and I loved it at school, once I started fixing people pcs, I hated it. Trying to figure out what somebody already tried to do to fix the pc before they called was often the hardest part of the job.
Either way, think about it, keep researching and good luck with your future!