I can explain a simple method of what I described.If your playing with a laptop or tablet it's easier because you can have it open in searchable form while playing & I'll get into if not after because the first part is the samePerhaps its just my awful memory but when it comes to balancing lore, background, cooperation, and timelines, my notes become burdened and my brain begins to lose track. Adding spells with descriptions that can't be summarized with something like "8d6 Lightning, Action, VSM, Line 100ft" is difficult to keep in my notes and in my head.
I get that its a personal experience, but I put a huge emphasis on mental fatigue from playing a class when I decide whether its a good class or not.
copy the spells out of whatever format you are using (ie pdf, dndbeyond, dead tree) into a word doc or PDF, format it in any way that seems logical. Open the resulting file alongside your character sheet while playing so it;s there in another window or tab
If you aren't using a laptop or tablet (phone will be too small & just add frustration) you can make the spellbook & either plonk the pages in a 3 ring binder type thing or just take it to a print shop like staples to have it spiral bound .
GM'ing tends to make picking up what spells do mentally a bit easier when playing. Everyone seems to have their own method, but building your own spellbook with the spell descriptions seems to make a big difference from what I notice in players