Yeah, just starting to bike to work one day is often impossible, just like starting to commute by car would be for someone who lives car-free.
It’s a lifestyle you have to make possible. For me it was always a high priority in life, cause it turns wasted time in traffic into exercise, fun, and, depending on weather, a bit of adventure every day. I’ve never even considered a home or work place that didn’t allow for a bike commute. Which means I didn’t take the highest-paying job I was offered, and didn’t rent the cheapest place per square meter. But I also don’t have a car payment or gas expenses and I arrive awake and relaxed both at work and at home.