I'm going to ask you the same question that Jesus asked a lawyer...How readest thou?? (Luke 10:26).
The author of Hebrews is Paul.
Hebrews 13: 22 - 25
22 And I beseech you, brethren, suffer the word of exhortation: for I have written a letter unto you in few words.
23 Know ye that our brother Timothy is set at liberty; with whom, if he come shortly, I will see you.
24 Salute all them that have the rule over you, and all the saints. They of Italy salute you.
25 Grace be with you all. Amen.
Now everyone knows about Paul's infirmity. Which meant he had vision issues and as a result he had scribe. The letters Paul he literally tells you that he wrote them with his own hands. Let's see some more examples.
Philemon 1, 19
1 Paul, a prisoner of Jesus Christ, and Timothy our brother, unto Philemon our dearly beloved, and fellowlabourer,
19 I Paul have written it with mine own hand, I will repay it: albeit I do not say to thee how thou owest unto me even thine own self besides.
Plain and simple. Now let's see an example of an epistle he did not write with own hands but he still is the aurthor.
Romans 16: 20 - 22
20 And the God of peace shall bruise Satan under your feet shortly. The grace of our Lord Jesus Christ be with you. Amen.
21 Timotheus my workfellow, and Lucius, and Jason, and Sosipater, my kinsmen, salute you.
22 I Tertius, who wrote this epistle, salute you in the Lord.
Tertius is actually the one who wrote the book of Romans. So, the books Paul wrote he said he wrote them with his own hands and if he didn't the scribe wrote what he was asked to write. Go back and read how all the Epistles start, they are all from Paul. Paul said he wrote Hebrews and therefore it was written with his own hands. Hope that helps have a good day.
I still say that we don't know because we are not told who wrote Hebrews. You mention Paul's infirmity. He wasn't the only Christian to have an infirmity. You say, "Paul said he wrote Hebrews and therefore it was written with his own hands." Sorry, where does Paul say that he wrote Hebrews? You also tell me, "Go back and read how all the Epistles start, they are all from Paul." That is true, but the start of Hebrews doesn't mention that Paul was the author. Hebrews starts:
(Heb 1:1) God, who at various times and in various ways spoke in time past to the fathers by the prophets,
(Heb 1:2) has in these last days spoken to us by His Son, whom He has appointed heir of all things, through whom also He made the worlds;
(Heb 1:3) who being the brightness of His glory and the express image of His person, and upholding all things by the word of His power, when He had by Himself purged our sins, sat down at the right hand of the Majesty on high,
(Heb 1:4) having become so much better than the angels, as He has by inheritance obtained a more excellent name than they.
(Heb 1:5) For to which of the angels did He ever say: "YOU ARE MY SON, TODAY I HAVE BEGOTTEN YOU"? And again: "I WILL BE TO HIM A FATHER, AND HE SHALL BE TO ME A SON"?
(Heb 1:6) But when He again brings the firstborn into the world, He says: "LET ALL THE ANGELS OF GOD WORSHIP HIM."
(Heb 1:7) And of the angels He says: "WHO MAKES HIS ANGELS SPIRITS AND HIS MINISTERS A FLAME OF FIRE."
(Heb 1:8) But to the Son He says: "YOUR THRONE, O GOD, IS FOREVER AND EVER; A SCEPTER OF RIGHTEOUSNESS IS THE SCEPTER OF YOUR KINGDOM.
No mention of the author.
I stress that I am not saying that Paul didn't write Hebrews, but that we are not told who wrote Hebrews. The important thing is that, like the rest of Scripture, the ultimate Author of Hebrews is God Himself.