Viking

Yeah. The sentence is grammatically wrong. But without context, reading this sentence i would say that the verb is missing. The computers are removed from the list.

It's certainly possible. No doubt about it. I've checked it on myself and still continue to improve. I would even say if you really want to learn and are ready to put the time and effort in it -- you are going to succeed even on your own. But without an effort - the won't be any results. And if you are lazy -- no matter what school or tutor you have -- the results will be poor. Considering the abundance of learning materials and multimedia, you can be very effective on your own. I think video lessons, podcasts etc. can substitute a teacher almost completely. The only thing you need is to be persistent and methodical.