I started making my own yogurt about a year ago and it is simple! You'll both be able to do it no problem, and you won't have to buy any machines either.
This is how I make mine:
2 litres of whole milk (you can use semi skimmed milk, but the end result won't be as thick)
8 tablespoons of live natural yogurt (as fresh as possible)
I use organic variants of each of the ingredients.
1. Take the yogurt out of the fridge to allow it to warm up a bit.
2. Heat the milk to 185 degrees F, the place the pan in a bowl of cold water and take it down to 112 degrees F.
3. Add the 8 tablespoons of yogurt to the milk and whisk in well.
4. Transfer the mixture into clean, sterilized jars, I put mine into 250ml jars as in the picture below, but you could use larger or smaller jars if you wish.
5. Put your jars into a cardboard box lined with a towel and tuck the towel all around your jars. Leave for 8 hours in a warm place - I put mine in my airing cupboard.
6. Unpack and place in the fridge for at least 2 hours to chill and set fully.
I usually serve mine with homemade granola, muesli or fruit compote. Or, you cold have a drizzle of honey or any other flavor you like with your yogurt.
You can also use this yogurt to make your next batch, and so on and so forth.
I'm happy to give any more help, if you need it.