I must add my 2 cents worth here, as we just had to fit a new gasket on our "Loo" (for the Brits among us) I don't know how you're "supposed" to do it, but I ended up with my hand down inside the toilet, through the thingy that opens and shuts with the flush.........so that the screws wouldn't fall
into the holding tank! I have long fingers and smallish hands, so it worked, but I'm pretty sure there must be a better way? My husband is big boned with giant hands and just could not have done it, not to mention the knee replacement and curling up in that little space. Great incentive to stay flexible and not get too fat.............