When it comes to believing God for healing there are many ways in which a person's faith is expressed. Some believe God to such an extent that saying the word is enough. Sometimes Holy Spirit may make you realise that they need to be anointed with oil and when you perceive this, then anoint with oil as well as command healing.
James 5:14 Is anyone among you sick? Let him call for the elders of the church, and let them pray over him, anointing him with oil in the name of the Lord. 15 And the prayer of faith will save the one who is sick, and the Lord will raise him up. And if he has committed sins, he will be forgiven.
I should point out that some in the body of Christ may not have total confidence that god always wants to heal. You may hear people say that, "This all died out with the Apostles"; or "We have good doctors now so God doesn't do this anymore" or "It all depends on God's sovereign will, of course!".
They don't want to build your hopes up or raise your expectations beyond their own experience. It's safer if you don't expect too much from God.
The believers of Jesus' time though expected God to do wonders and he did. God expected them to command healing in faith, not ask Him to do it as Paul mistakenly did at first in 2 Cor 12:8-9.
2 Corinthians 12:8 "Three times I pleaded with the Lord to take it away from me. 9 But he said to me, “My grace is sufficient for you, for my power is made perfect in weakness.
Jesus told his disciples to "Heal the sick", not plead with God for Him to heal the sick! Finally God got through to Paul and he wised up that God's grace in us is sufficient for US to do the healing "In Jesus' Name". Always provided WE have faith and do not lose hope. Faith builds on hope. Faith is the substance of things HOPED for!
As a believer you have the power in you (God's grace) to heal yourself and others. Just as salvation is "By Grace through Faith", so also healing is "By Grace through Faith!". God loves you and has provided healing as part of the atonement Jesus bought for us all.
Best wishes for Grace and the Peace of Jesus.