Insight:
I have been interested in owning a ball python for almost a year and did all my research in upkeep, costs maintenance etc and thought I was ready. A couple of days ago I bought a new young ball python. I do not know the sex or phenotype of the little one and bought it from a well reviewed pet shop in my area that sell many reptile pets.
Along with this reptile I bought a vivarium that ,I was told by the workers at the shop, would last around a year as it would eventually outgrow. (no problem). It has a fluorescent light bar, heat lamp and heat mat with the vivarium itself being made of beech wood and with glass doors. A couple of rocks, plastic plant, watering bowl and 2 half log hides for decor. A fir bark substrate covers the heat mat which resides in the centre.
With the initial set up I was surprised that I wasn't given a thermometer and hygrometer which gave me a lot of anxiety for the first night. The next day I went back and got the extra (plus a wedge). My second alarm was that the humidity seemed to vary so much and that perhaps the hygrometer was unreliable.
I knew when I set out to get a ball python that it wouldn't be super easy and I liked the idea of taking responsibility but this anxiety for my pets health is making me feel quite unwell
Summary
I want to be a good owner and the health and well being of my ball python means everything:
Is my set up adequate?
Should I make any changes to the set up?
With university fast approaching would it be better to take the young ball python back to the pet store or try to make this work?

(apologies for image quality)
Extra details
Zoo Med Premium ReptiBark - Natural reptile bedding
Arcadia IP67 vivarium ultra seal fluorescent lighting controller
Arcadia 450mm/18" Desert 10%+ lamp (9 month UVB) 15Watt
ProRep Basking spot lamp 40Watt
Heat matt (Currently in use so I can't clarify the make)
I was recommended to leave the UVB and Basking lamp on for 8hrs a day between 9.30am and 5.30pm and the heat matt 24/7.
Humidity varies from 50-80 although the substrate does not feel damp.
Temperature usually maintains 30-35 Celcius when both lamps are on (day) and 25-30 when only the heat matt is on (night)