At first glance, it seems that beginning a process essay would be easy: just start with the first step, right? Well, perhaps so, but if your readers aren't interested in your process, they might just put your essay aside and go watch television, and you don't want that. Your beginning ought to involve readers in the human dimension that makes knowing your process important to them. If you're going to write about how to jump-start a dead car battery, don't start with hooking up the cables. Start with the dark snowy morning in the parking lot, and there's no garage around, and sleet is dripping down your neck, and how do you hook up these stupid cables you find in the trunk? If you're going to write about how to make a soufflé, don't start with the eggs. Start with how you'd feel if your new mother-in-law came over for dinner and your souffleé came out looking like a pile of scrambled eggs and then tell your readers how they'll feel if they do things way! Your readers might not be interested in car batteries or soufflés, but they will be interested in the human condition of being stuck and miserable or embarrassed, and they will read on.
Absolutely not if you want band 9. You must use natural language, not phrases and sentences you have learned from an academic writing website or book. Never learn sentences to put in your essay. Each essay is written uniquely depending on the topic. Any learned sentences are not counted by IELTS. I strongly suggest you get at least one of my advanced lessons in writing task 2 so you understand not only the techniques but what IELTS is all about in terms of how it functions as a language test:
The Science of Why We Don’t Believe Science – Mother Jones
There is, of course, a difference between a process essay that tells readers how to do something and a process essay that describes the process by which something gets done by someone else or by nature. You could write a great process essay describing what happens when Mother Nature decides it's time for trees to lose their leaves in the fall. Something in the changing angle of sunlight tells these two rows of cells in the leaf's stem to begin to dry up, and the chlorophyll begins to dry (allowing the leaf's other colors the red, the orange, the yellow of fall to show through) and then the stem breaks at just that point (the same for every leaf) and the leaf falls off. Neither you nor your readers are actually, physically, involved, but the process is fascinating in its own right.