Dave Armstrong has posted a series of "25 Short Arguments on the Difficulties of Perspicuity (Clearness of Scripture for Salvation)" (link) from his book "501 Biblical Arguments Against Sola Scriptura: Is the Bible the Only Infallible Authority?" I can see that his list of arguments has received nearly a thousand views, so perhaps it makes sense to provide a response to each of these. The arguments themselves are not long - individually they are no more than smudges that aim to obscure Scripture's clarity. This is number 6/25 of my wiping away of the smudges.
6. Is every Christian in the world able to find enough time, and become educated enough and familiar enough with Scripture to be his own theologian? And if he consults other ones, wise enough to always get it right when he chooses?
The most necessary things of Scripture are simple enough not to require someone to be a "theologian" per se, and the right approach is test others' teachings by Scripture rather than relying on one's own wisdom.
The way to avoid relying on one's own wisdom is to rely on the Scriptures:
My son, forget not my law; but let thine heart keep my commandments: for length of days, and long life, and peace, shall they add to thee. Let not mercy and truth forsake thee: bind them about thy neck; write them upon the table of thine heart: so shalt thou find favour and good understanding in the sight of God and man. Trust in the LORD with all thine heart; and lean not unto thine own understanding. In all thy ways acknowledge him, and he shall direct thy paths. Be not wise in thine own eyes: fear the LORD, and depart from evil.
Furthermore, the Scriptures assist even the simple:
Psalm 19:7 The law of the LORD is perfect, converting the soul: the testimony of the LORD is sure, making wise the simple.
Psalm 119:130 The entrance of thy words giveth light; it giveth understanding unto the simple.
That's one of the reasons that the Proverbs were written:
The proverbs of Solomon the son of David, king of Israel; to know wisdom and instruction; to perceive the words of understanding; to receive the instruction of wisdom, justice, and judgment, and equity; to give subtilty to the simple, to the young man knowledge and discretion.
So one does not have to be wise to nevertheless receive wisdom from Scripture. Scripture is prepared and even specifically provided to help give light to those who are not professional theologians.