The classic approach is behavioral deconditioning, or desensitization.
Are you scared of a picture of a lizard? Then you must relax your muscles while looking at the picture. Fear cannot exist when the muscles are relaxed. When you overcome the fear of the picture, you then go through the procedure for something more scary; maybe a video of a lizard, or looking at a lizard at a distance, or whatever. Something that is a little scary to you but not overwhelming. And so on until you are as comfortable with lizards as you want to be.
It may also help you to learn as much about lizards as you can. For instance, hardly any lizards are venomous; and most of them cannot do you any harm beyond a minor bite, which may not even break the skin. Many lizards are not even strong enough to bite hard enough to hurt.
I have been afraid of them for a while and I need help soon
