Very much alright to do so.
I spent my first year and a half reading only for myself. I still read often for myself, but now sometimes for others too. Reading for myself helped hone my skills, and taught me so many lessons that changed my life for the better.
A reading I did for myself even changed my life once in a VERY deep way. I was thinking of quitting my job....long story. In fact I would have quit, had I not done a reading to be sure. It said I should stay, I would miss out on a major life lesson if I left...and if I stayed a lot of cards came up about love. As the question was about my job...I thought it meant I would learn to love my job.
So I did not quit, and about two weeks later this man started working there. He stayed only 10 days but we are still seeing each other and I do very much love him now. When I think that I would have quit and never ever have met him, had I not done myself that reading, and how he is such a force for good in my life... If that's not a case for reading for yourself I don't know what is
I definitely use it for self-improvement too. I consider myself a continual work in progress as none of us can ever be perfect...My readings have taught me more patience, made me feel more connected to everything, solved major life problems, pointed me to right spiritual path (over and over). I would never stop reading for myself, not to mention taught me a deep wonder at the magic of life.
Reading for yourself takes a higher level of objectivity sometimes than reading for others. As you will tend to care more what the outcome is, because you will live it. The main skill it takes to read for yourself is to be able to be really objective. To just really want the truth no matter what it is, not just a happy sounding answer. Otherwise you can read things into the cards that are not there. If you want to see the positive only and not the negative, adn there is something negative coming--you not see it coming and walk right into it. But if there is something negative there, better to know anyway, so you can do another reading and find out how to fix it....then you take the steps to fix it and voila catastophe averted.
Tarot can often do that, show you how to sidestep experiences in your future you don't wish you have. It is more than a tool to predict the future, it is a tool to change it to the future you want to have.
There is no reason in fact that you ever have to read for someone else if you don't want to. It's your path that you're on, do what feels right to you. To me Tarot is a very individual path. When you sense something feels right to you follow it and reject what doesn't
Babs