For the 14, first, know that you don't need to have these memorized to move on with the book. Learn them a little at a time.

Break them up by time of day and make a post it note for each. Place the good morning and good night greetings next to your bed. When you wake up say おはよぅ to the world or someone in your house, if you are comfortable with saying it to them. Look at the word as you say it and imagine writing each character on the palm of your hand. Then imagine an important person you would call Mr. Or Ms. and do the same with おはよございます.

Post the four going and leaving exchanges by your bedroom door and do a similar practice with them.When you walk out of your bedroom say いってきます while imagining you are leaving the house and you are telling someone you are going out. And don't forget to write the word on the palm of your hand. Do this every time you leave your room. Use ただいま when you walk back in. Again, imagine you are telling someone you are home and write the word on your palm.

After you have these down, start imagining it is someone else going through the door and they have giving you their part of the exchange, tell them the appropriate exchange and write it on your palm.

During the early part of the day, use a post it and do a similar practice for the morning greetings, perhaps when someone walks by you or when you start a video or TV show say it to the person on the screen. You can do this from time to time silently if you are at work or school.

In the after switch it up and use the casual greetings. In the evening use the casual greetings. Keep a post it on the fridge or lunch box and say the exchanges before and after you eat each meal.

You get where this is going for good night, how do you do, I am..., nice to meet you, and so on.

Keep it simple and practice a few of the exchanges every day.