Installation or replacement of a toilet is not as much difficult as it seems. Yes, you can replace or install the toilet on your own. If you have some of the backgrounds, then this will be quite easy for you. You just need to stick to the basics.
But the installation of the heavyweight and advanced type of toilets do need assistance from an expert. Yet the plumber knows better than you as he has experience of the problems that common with the advanced type of toilets.