It depends on how you learn. Some people can learn easily by reading the instructions, some require hands on lessons.
I would say try it yourself. Get a Wilton book, or just go to the Wilton site. All the basic recipes are there, along with clear instructions for many techniques.
Start by frosting a "cake" and making it smooth. You can use inverted cake pans or cake dummies for practice.
Then try making borders- a batch of icing and some inverted cakes pans works great. You can scrape it off and do it over.
If you find it isn't coming together, a Wilton class would be an excellent step.
Experience is the best teacher. You can practice a lot of techniques on a practice board (cookie sheet, or a cardboard covered in freezer wrap). Make small cakes for your family and friends choosing simple designs. A cake mix will make a two layer cake; just keep the layers as separate cakes. Use the "SEARCH" area of this forum to find almost everything for advice.
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