How to say "take the first step bravely" in idiomatic English

Not long ago, when an American commodity salesman went door to door to sell goods, such as vacuum cleaners, kitchen supplies, encyclopedias and bibles. When a housewife hears a knock at the door and opens the door, the clever salesman will put one foot into the door first, so as not to let the hostess close the door before he has a chance to introduce his goods. This kind of door-to-door sales promotion almost does not exist now. Now most salesmen rely on telephone to solicit business. However, putting one foot in the door first has become a common saying. In English, it means putting one foot in the door first. Taking the first step means taking the first step to achieve your goal, although you may be far from achieving it. The following example is said by a student: Example-1: "Do you know the beautiful girl sitting in front of me in English class? She always refuses to date me, but I finally took the first step today: she went to have coffee with me after class. Do you know the beautiful girl who sits in front of me in English class? I asked her out to play, but she always turned me down. However, today I took the first step. She promised to have coffee with me after class. "The following example is that two people are talking about a friend with political ambitions. One of them said, "It is difficult to enter politics. However, Martin took the first step when he volunteered to put up posters all over the town to help Republican congressional candidates. He said: "It is very difficult to enter politics. However, Martin took the first step into politics by volunteering to help those candidates who ran for Congress with his party put up slogans in the local area. "It's really tiring to put up slogans or posters on wires all day. When Martin comes home, he may feel his feet are too tired to stand up. There is another sentence to describe this situation: one person is exhausted. Although the United States is one of the most advanced countries, there is still a lot of work to be done by staff standing. The shop assistant is one of them. After standing all day, they are bound to feel tired when it's time to get off work. Example 3: "Honey, I have to sit down and have a rest before taking you out to dinner. I'm really exhausted tonight: we're having a year-end sale. I'm too busy. I said to him, "honey, I have to sit down and have a rest before I go out for dinner with you." My feet are really exhausted tonight. We are going to have a big sale at the end of the year, and I am so busy that I don't even have time to have lunch. " The following example is a child telling his classmates that his family went to see a parade celebrating the Gulf War: Example -4: "My parents took me to Constitution Avenue to see the paradox. After standing there all day, when we got home, my mother was too tired to cook dinner. " My parents took me to Constitution Street to watch the parade. We stood there all day, and when we got home, my mother's feet were too tired to cook dinner. "Today we explained two common sayings related to feet, that is, foot or foot in English. The first proverb we say is: taking the first step is the first step to achieve the goal. If you like it, put it on top.