To start - this tutorial is really helpful. It’s in Z-Brush, but translates to Blender pretty well. For a beginner, I’d say it might be more of a This is how it’s done kinda deal rather than a follow step by step. Though it’s very helpful, and should give you some pointers in the same way.
A problem you seem to have is that you’re going too dense straight out of the blocks. Don’t do that. Try and keep general shapes and forms loose initially, until you are satisfied, and then you can go up a level of detail. With each pass of detail, you should start to get something that’s more final.
Reference is also super important. A lot of people will say study anatomy, human forms, etc…that all helps, and some very basic knowledge of anatomy will help you. (Just look as some skulls, and see how they are structured for men and women)
The most important skill is actually observation, I’d say. The ability to be able to look at a reference, or a sketch - or whatever - and spot what’s different on your mesh, and apply the necessary changes.
I’d say going from “noob” to sculpting a whole head with perfect form and anatomy is difficult, but not impossible. Just take your time, watch other people sculpt, pick up some of their techniques and steps, and apply that to your own work. It might take 4 hours, it might take 40 - who knows, but you can get there for sure.
Also, don’t be too hard on yourself. Try and be realistic in your own expectations. You’re not going to have perfect results straight away - that’s perfectly fine.