yeah get a decent set of headphones. i do most of my arrangements in shitty sennheiser can (because they are comfy af and can wear them for hours) then when i want to start nailing things out i use the studio monitors. Find its much easier (and more comfy) to do things at low volume in headphones. if im trying to block out noise and produce ill put in my shure inner ears (SE535, couldnt recommend them enough for the pricepoint). its good to get in the habit of mixing across a few set of speakers but have one main set that you have a good understanding of. For example, i know my sennys get alittle bass boost around 150hz so I put a little notch eq on my master when i use them (only about 1.5db) to just limit the 'booming' of my kicks. Now when i jump over to the monitors everything sounds flat (which in this case is a good thing).
As Labrat touched on earlier. learning your tools and skill development is still the key