Thinking of leopard gecko, any suggestions?

I'm almost settled with my iguana, just need a new aquarium. Well, i've reasearched a little on leopard geckos and i'm beginnin to like them, I want to add one to my collection. I have a lamp and the gecko can share the aquarium with my iguana temporarily, (since the iguana's previous owner joined his leo and ig together, but now my ig has been so comfortable with her territory so I might have to put the gecko in a 20 gal tank. I plan on getting a pair, my mom would be ok but my dad has to adjust and he really thinks they look gross, also only one petstore in our city has leos so it'll be hard to find a vet.. I know i'm not prepared but i read a lot and maybe i dont need a vet, I can get crickets(but not gut-loaded) and mealworms, and maybe some grhoppers (btw is it okay to pick from the garden?) i have everything i need , just needs some repairs, so suggestions? your own thoughts?