Prepare the ground
To start, you must prepare the ground. This is both a question of what you have, but also what you need. If you are feeling trapped, enclosed, shut down and rigid, you may need a wild space. Clear a few square metres amongst other plants, the rougher the soil is, the better.
If you are feeling fearful and at the mercy of too much beyond your control, you may want to choose a small plot. A Belfast sink maybe, a raised bed. At a push, a pot in a courtyard or on a townhouse balcony. Something manageable that you can touch and hold, a container or a neat square perhaps. Fill it with compost (if you have any), but if you are planting wildflowers, they are adapted to hardship, so they will not thank you for the nutrition. Instead, mix your compost with grit and take your time mixing it. Good compost has the same effect of a well baked loaf of bread in your hands; it is a medium of nourishment, growth and sustenance. If you need more order and control in your life, you could try to sow in straight lines. Make a drill in the compost, a little trench about a cm deep, in the surface of the compost.