When you are just starting out charging by the hour and starting with small stuff is fine. But your goal should be to transition to charging by the week as soon as you can afford it, because you can't afford to charge by the hour for your whole career.
Keep in mind that those that have 'arrived' tend to take their life experience and then condense it down to bullet points without nuance, after all, unqualified statements sound so much better than qualified ones. But it's all about the balance and to get to charging by the week you may need to start by charging by the hour.
Service > product > weekly rates > daily rates > hourly rates.
The further you are to the left the more money you'll make but you have to start somewhere.