There is fear to making any decision.
Then you sometimes will hold your nose even when you take action on that decision, but the ones that scare us the most can often give us the best surprises.
When we are fearful to start with, we often show up with our best effort, and from our best efforts we get the strongest momentum.
When we prove to everyone (most of all to ourselves) that we CAN do it and succeed, our decision to have a go is justified, and we tend then to make a habit of taking risks, all in the expectation of having the best outcomes for ourselves in terms of our health and just about anything else in life.
Succeeding gives us new levels of confidence every time, but we must face fear and doubt first, so get used to them being a constant in our lives, and working our way through this process is only part of normal life if we want to make our lives better.
Feel the fear and do it anyway.