If you plan to stay a one man band you really should be concentrating on refining your round, to me this means always keeping an eye on who is your lowest paying customers, and put these prices up to bring them inline with your best customers, if you lose them then replace them with better paying customers, I use a stopwatch to time every job I do and keep a record of it so I know which jobs are lagging behind, if I don't increase the price of these jobs I would soon start to resent doing them!