Cognitively I know how to change a flat but physically I just can not do it on my own. Heck, I can't even adjust the strap on my heart rate monitor or helmet. I am extremely bright and competent in other areas of life. However, I too have significant visual spatial difficulties which leave me mechanically challenged and frustrated. I am not whining, just stating a fact. It is not a matter of just practicing or deciding that I can do it. My brain just does not allow me to do this type of thing. Crankin, I understand completely, you are not the only one.