Go into all the world and preach the gospel to all creation." (Mark 16:15) Go is the opposite of "stay". Go means to go out the door to your neighbor, or go abroad to other nations. But the key is to go! This settles any doubt as to whether a person must go or not. He said "Go!", and that is pretty clear.
The key word "Go" also covers another very important area. Finances! It doesn't matter whether or not you have the finances (at the beginning of your commitment). When God lays it on your heart to go on a missions trip you continue to pray, and you start making plans to go, by faith. You begin making whatever preparations you can (at that current time) to prepare to go. I've heard so many well-meaning folks say, "I would love to go on a missions trip, but I just don't have the money." Always remember, money doesn't determine God's will for missions, He does. He established the rule over 2000 years ago when He said, "Go into all the world!" God is responsible for providing the finances for a missions trip when we commit to going. I've seen Him miraculously supply over and over through the years.
Once you've committed to going on a missions trip, and you're praying and preparing, then you look for ways to help to raise money to finance your trip. But again, never let finances (or lack thereof) be the reason you can't or don't commit to going on a missions trip. Embrace His command to "Go!" and He will open incredible opportunities to take the Gospel of Jesus to anywhere He wants you to go! Jesus faithfully stands behind His commandment for you and me to "Go into all the world and preach the Gospel." Your part, and my part is to obey and GO!
You can contact Harvest Missions at firstname.lastname@example.org.