It is achievable if you sell extras like tiles and adhesives etc on every job you can and you have good contacts, you can up sell to adding design work into the job for extra money, what people forget is that you have to be a salesman before you are a tiler, if you dont sell your work, doesnt matter how good a job you would have done, someone else is doing it and making your money. Think every way you can on how you can earn exras from the job, thats what i teach, thats when you will notice the money comming in, had a lad ring me last week to say that he made £150 profit on the tiles and £60 on adhesives before he even started doing the job, Think like that.