Re: Is it possible to train Aikido by my self?
Not only possible, but essential, IMO. The down side being that you need to know what you're doing (as with anything else, I suppose) before solo training becomes really meaningful.
For those who don't think that it's possible alone - Morihei Ueshiba would spend hours training alone each day, and he gave demonstrations of Aikido - alone. Actually, one of the more unusual aspects of a lot of his weapons training was that it was done - alone, which is in itself quite unusual in Japan.