Here are four ways to overcome your challenges fast.
1. Ask Questions
Many new writers are wary of asking questions because they don't want to appear unprofessional.
Experienced writers, on the other hand, ask as many questions as they can. They ask because they don't want to misunderstand the parameters of a project. They cheerfully nag their clients for information. Indeed, if the client doesn't respond quickly to requests for information, a professional writer will often refuse to take on the project.
2. Get a Coach
Writing coaches are popular because writers understand that that they can learn from someone else's experience and knowledge. It saves time.
A writing coach will also give you confidence. If you're stuck on a project, the coach will show you how to complete it. And if you're stuck with a client who's uncooperative, a coach will show you ways to get the cooperation you need.
3. Create a Plan
Writers are creative, rather than methodical, and few take enough time to plan. Creating a plan is vital for large projects and for small ones. A plan can break down a large project into easily doable tasks. When you add those tasks to a calendar, your plan will help you to complete projects easily and before deadlines.
Let's say you want to write a book. Writing a book is a long process. It can take you a year or even more. Obviously, you need a plan. Spend a couple of hours researching what you need to do, and planning, before you start writing. It's time well spent.
4. Find a Model
Let's say someone has asked you to write a brochure. Your first step might be to ask the client for other marketing material the company is using. Your next step might be to go through your archives, and find some projects you can use as models.
If you don't have any work of your own you can use as a model, you can use others' work.
For example, if you want to write a book, there are millions of books you can use as models.
The novelist EL James did this. She wrote her popular "Fifty Shades" trilogy as fan fiction, using the "Twilight" series of novels as a model.
The more experience you have with writing, the more comfortable you'll be. Try the above methods; they'll never fail you.