When one is just starting out, and simply "fooling round", trying to find something interesting to do, perhaps it is not that critical to work hard. In fact it may be argued that one should not work that hard during this time. This is a time that is typically filled with disappointment and frustration, and perhaps a cavalier attitude is best. Try your best and come what may ("whatever" as teenagers now say). Trying too hard will only lead to greater frustration, so stay focused but loose.
But when you get on the right track after a few months and in your mind's eye can see what mother nature is really saying, that's really the time to work really really hard. This is the time when the methods are all working, the constructs are all made, the experiments are all lined out (pretty much), there is only one thing to do. WORK WORK AND WORK. Get it done. There will be lots of lazy afternoons afterwards. Undoubtedly there will still be setbacks and frustrations (that's how this works, OK), but in the end the pleasure is - as Feynman famously said - in findings things out!