Why would you want to do that? lol, but seriously NO, dont trim them, you only hurt your plant and do you realize that everytime you cut a growth tip 2 more will appear? If you were doing it for that reason then i'd say go for it if you want.
im new to this, im not sure on exactly what to do, right now im just letting it grow
but some of the leaves on the bottom of the plant are turning yellow, will those just fall off or what should i do?
Don't touch a leaf or stem and when she gets about 12" high you will see her branches go uneven (asymmetrical) that is a sign of maturity. At that point you may want to induce flowering.