Following an initial meeting, the first task will be to establish the general facts of the case. This will include your medical diagnosis, which will need to be confirmed and documented by a doctor; and proof that the person or company at fault owed you a duty of care, which will need to be demonstrated. Together, this will show that your injury occurred when they breached that duty of care.
From there a further investigation will proceed—contacting and interviewing witnesses, speaking with expert consultants, and more—all in order to bolster the strength of your case even further. Only once this process is complete, and your claim can be demonstrated and proven in full, will the process move on to the next step.