Before you buy any large item, such as a car, you typically want to take it for a test drive first. It is also true when you buy a house. Hopefully, you are also considering taking a serious look at retirement before you retire—which is even much more expensive than a car or a house.
No matter how well you think you understand what you will need in retirement, taking a test drive will let you see if your expectations are realistic. Most likely, since you have never retired before, you cannot be sure until you take a realistic test. You will likely find afterward that you need to make some changes to your retirement plans. It could be especially useful for those who want to retire early.