Matthew 28:18-20 says:
All authority has been given to Me in heaven and on earth. Go therefore and make disciples of all the nations, baptizing them in the name of the Father and the Son and the Holy Spirit, teaching them to observe all that I command you; and lo, I am with you always, even to the end of the age.
Acts 1:8 says:
But you shall receive power when the Holy Spirit has come upon you; and you shall be My witnesses both in Jerusalem, and in all Judea and Samaria, and even to the remotest part of the earth.
Are these two passages asking about the same type of power here? Matthew talks of authority and Luke (author of Acts) talks of power. Are these two the same thing? No. Matthew gives us the right to carry out the commission, while Luke gives us the might to carry out the commission. Conclusion: We’ve got the right from Jesus and the might from the Holy Spirit to carry this out. We’ve got all we need.