Do your course, tile your bathroom, do some family and friends jobs to gain experiance then if you feel confident go out there and advertise yourself.
That's what I have done.
I was looking at getting a simple standard ceramic splashback or 2 for my first couple of jobs, but I ended up getting a half tile large toilet and 2 kitchen splashbacks, all in mosaics for my first job, lol
If you feel that your able, then go for it