I had to get away from it for a while, so I forgot how good the book Right Concentration: A Practical Guide to the Jhanas is. I tend to be more interested in the science behind mindfulness and meditation (as opposed to specific religions and their rituals), and as a result, from my own practice I can confirm the last sentence in this paragraph from that book. (See the attached image.)
Depending on the day, and especially the time of day, the first 5-10 minutes of any meditation session are the hardest for me, because it takes a while to get my mind to settle down. Since I learned this practice, I do settle down more quickly.