Yes, difficult but doable.
the downside is that one never stops improving critical abilities.
the plus is that you don't have to hone your abilities only on your own work; you can look at other people's work - and the critiques - and learn from each of them.
look at 50 pictures a day and try to decide whether they are well done or not, read the critiques if there are any - at the end of a month your ability to 'see' the defects in your own work will be vastly improved.
I wrote these two articles (they are essentially the same so I won't charge you double)
Lew Lorton Photography | How to improve your photography: your own twelve step program and
Lew Lorton Photography | 11 Tips for Beginning Photographers - How to Start Taking Pictures.
See if anything in there might be helpful.