Resistance is common with writers who take on long term projects. Perhaps you're writing a book, or blogging. Or perhaps your boss has dumped a huge report on you that you need to turn around within a week.
Luckily, since you're the one who's putting the pressure on yourself, you can take it off quickly. Just remove your expectations.
Make a decision: no pressure
You could spend ten years in therapy discovering why you have resistance to writing, or you can just decide to take the pressure off yourself. Yes, it's really that simple. Just decide that you'll write without pressure.
Writing without pressure is easy. If chatting with your friends is easy, writing is just as easy.
If your boss is putting pressure on you
Perhaps you're thinking, "Yes, but I'm not putting the pressure on myself - my boss is! I have deadlines."
If someone else is pressuring you, you feel pressure because you're pushing back. Stop pushing. Let it go.
How to take the pressure off
Once you've decided to take the pressure off, just start writing. Within a few sentences, you'll be completely focused on your writing and you'll write more quickly. Your writing will flow.
Decide to stop pressuring yourself. That's all you have to do.
When you do this, your writing will flow, and writing will seem easy and enjoyable.
Get the "writing easy" habit with a journal
Taking the pressure off yourself when you write is a matter of habit. You can develop this habit if you write in a journal each day.
When you write everything in a journal, it's a casual way of writing. Just outline everything you want to write in your journal, and then write it as quickly as you can. This works for everything: sales reports, email messages, articles, and books.
Then copy the material from your journal to another document. Your journal-writing kick starts your writing process in an easy, informal way. Consider your journal writing a zero draft - it's not a first draft, it's just a beginning to all your writing.
Often you'll find that a writing project is complete with the writing you've done in your journal. If it isn't, revision and rewriting is easier when you've made a start by writing in your journal first.
For your first few weeks of writing with this new process, get up a little earlier each day so you can write a page or two in your journal. This seems to prime the pump of your writing, so that all the writing you do that day is easier.
Most importantly of all, relax and let go. Without resistance, writing is easy - just stop making demands of yourself. The wall of your own resistance will crumble. Not only will writing be easy for you, but you'll write more, and will have more fun with your writing.
Try this simple, easy process, and judge the results yourself.