In making a repair to my toilet last week I found this useful resource: Replace The Toilet Fill Valve, Flush Valve Or Flapper
Your first step is to shut off the water. In most cases, you’ll have a shutoff valve right next to the toilet coming either through the floor or out of the wall… If the height of your valve is adjustable, set the height before you install the valve (Photo 5). If your valve is a different style from the one we show, check the directions. After mounting the valve (Photo 6), connect the fill tube (Photo 7). The fill tube squirts water into the overflow tube to refill the toilet bowl. The water that refills the tank gushes from the bottom of the fill valve. When you install the valve and supply lines, turn the nuts finger-tight. Then give each another one-half turn with a pliers. When you turn the water supply back on, immediately check for leaks and tighten the nuts a bit more if necessary.
The site does a great job of explaining what needs to be done and provides excellent graphics. It is also interesting to take a look at how things we use actually work.
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Interesting site. When fixing people’s cisterns it is becoming more common to see blocks/bricks placed in the cistern meaning less water is used. Cheaper for people on a water meter.