If you have a four year old that NEEDS to get K ready this year, I think LOTW is great. It covers a lot of areas at once.
Often, though I just use it as a jumping point. We just spend a lot of time, do crafts, etc, using the letter, number, color, shape of the week.
It makes a good outline to start, then you can get creative.
For example on A week, the color might be red, the shape a circle and number 1. We read books and emphasize those words. Eat apples, cut them into circles, and give everyone ONE at a time. Talk about which apple is red and which is not (have a green or yellow one.) Eat circle shaped sandwiches or crackers, with red strawberry circles.
Do simple apple/red/circle crafts. Make a
lapbook for each week with the theme stuff in little booklets.
And you can start with any letter you like, as long as you hit them all. If I only have one child, I start with their names. I also spell their names to them a LOT and have them on tags around the house (anything that is individualized)