It's handy to have a shutoff specifically for the toilet. Whether you can install one easily depends on how it is currently setup...a picture of what is there now would make advising you more reliable.
Measure from the finished wall (not the baseboard) in back of the wall to the bolts holding the toilet down. Unless you have a weird toilet, that is the rough-in dimmension, and determines the toilets that will fit. "normal" in the USA is 12", but it could be some other value. You don't want to pick a toilet then find it doesn't fit!
Depending on the status of the toilet flange, supply line, and subflooring (if there were leaks, the floor could be rotten), the install could be easy or hard. Sometimes you can't tell until you get things apart.
A toilet is fairly heavy, so lifting it into position might tax some people, male OR female. Also, 1-piece are heavier than 2-piece toilets, since on many, you can install the tank after setting the bowl in place (thus, there's less to lift).
A picture of what you have would make advising better. In the meantime, search for Terry's 'sample toilet installation instructions' to get a generic idea.