Beginners over-read some bits of advice, and under-read others. At least that’s my observation from my admittedly smallish beginner sample of one – myself, thirty years ago. I remember leaving potting mix under plastic in the sun so that I could plant azalea cuttings ‘into warmed soil’. The reference book that used these very words didn’t tell me that the soil had to be warmed, and stay warmed, for the duration of the several-month rooting process via a heated propagation unit. I diligently, and uselessly, followed exactly what I was told to do. On the other hand, when I was firmly instructed against buying pot-bound plants, I blithely dumped that advice into an over-warning file, and bought whatever I damn-well pleased.