.... it's not by asking YA questions
.... it's not be following the sacraments (or any other man made rituals!)
.... it's not even by reading the bible or through prayer.
The ONLY way is through REVELATION through the Holy Spirit. In other words, it's not in your control. NOTHING you do could bring you to the blessed assurance.... NOTHING. It is ONLY by God's grace that you can know because it's ONLY by God's grace you can know Him.
It might seem pedantic to look at it this way but without the right attitude you CANNOT please God and without pleasing God you will not get God's revelation!
..so am I saying you should do nothing and wait for God to show up? By no means! I'm saying you should do EVERYTHING possible to seek God...prayer, thought, words, reading, discussion, etc. and in your sincere seeking God will meet with you and you will KNOW.
put simply.. if you have the right attitude, God will show up and if you don't God won't no matter what you do