I have discovered that the power of the Holy Spirit is strongest when there is a purpose for it. Meaning that God has a particular job that needs to be done, and He gives me the ability, the knowledge, the anointing to do it.
When you are willing to be used by God, God will use you. Potluck is correct, in that we are vessels that need to be refilled. The power of the Holy Spirit fills you, then is poured through you and out to others. Just as a glass of water is filled for a purpose, and is poured out, or drank in.
Another analogy that you might consider is a pipeline. The more God can use you, the more the Spirit moves through you. Just as quickly as the Spirit is poured through you and out to someone else, you are filled again with a fresh anointing for another. It does not always happen that way. There are times of rest, times when we need to be refreshed and renewed.
Walking in the power of the Holy Spirit makes you a beacon of light. Light draws bugs, so to speak, and in addition to ministering to others, you will also need to be fighting battles along the way.
Lets look at a typical walk with the Lord. The first step into the kingdom is when a sinner confesses Jesus Christ as Lord, and becomes born again. Old things have passed away and you become a new creation in Christ.
Scripture says that we are crucified with Christ. Your sin nature is put on the cross. I have heard many sermons about how Christians struggle to come down off of the cross. It ought not be so. We are to die there. It is only then that we can be raised with Him. We are raised in the power of the resurrection and walk in the power of the Holy Spirit. If one is still struggling with past sins, it seems to me as if they have not died to it.
Prayer brings us through that process. When Jesus hung on the cross, he said "Into your hands, I commit my spirit." The day I prayed that, something powerful happened. We have now been crucified. And we have died. When you have died to self, you have not only given up your sin, but everything else as well. Your hobbies, your interest, your time. We no longer are in the image of Adam.
1Cr 15:49 And as we have borne the image of the earthy, we shall also bear the image of the heavenly.
However, we are told in Isaiah that God's ways are very different from ours.
Isa 55:8-9 For my thoughts [are] not your thoughts, neither [are] your ways my ways, saith the LORD. For [as] the heavens are higher than the earth, so are my ways higher than your ways, and my thoughts than your thoughts.
So what is God's plan for us? To be conformed to the image of his Son.
Rom 8:29 For whom he did foreknow, he also did predestinate [to be] conformed to the image of his Son, that he might be the firstborn among many brethren.
Simple prayers are powerful.
"Lord, take from me the things that do not please you, replace them with the things that you want in my life."
"Take my weakness, let your strength be made known."
"Take my foolishness and ignorance, replace it with your wisdom and knowledge"
The prayer "let your will be done" is giving up all of your rights, and allowing God to do what He wants. It is a prayer that says to Him that you trust Him. You trust Him with anything and everything.
Ask Him to show you what He wants you to do, where He wants you to go. Ask. When He sees that you have a heart to serve Him, then He will give you the revelation that you seek.