Basically, each type of bidet has a different way. So, it heavily relies on the type of bidet that you use. There is different type of bidet in the market and each type leads to same result which is cleaning your backside.
The most common types of bidets are the non electric bidet toilet seat and bidet sprayer. The difference between both types might be in the way that you set on the toilet. if you are using the hand hold bidet sprayer, you will have to hold the bidet sprayer by your hand and locate it in order to push of the button to give yourself the perfect wash.
where as the bidet toilet seat is some how adjacent to the toilet. So you do not have to hold anything by your hand. All you need to do is to have a clean throne, position yourself and simply turn on the button to have a perfect wash. Both types can be adjusted and controlled so the stream is exactly how you want it to be.