trans question

ok im thinking of changing my transmission to manual. I cant just buy a new car right now with a manual b/c its not possilbe at this time. So i just want to convert it. But i am really hesitant even though i am dieing for it to be manual. Truthfully i am worried about the risk. The car was built an automatic so im wondering if it is bad to convert it. I know it will lower the value of my car but im not to worried about that b/c i plan on keeping the car for a long time. So my question is it bad to convert it. Like will it hurt my car or up the rish for some major problems down the line.