The key central thing is that you sincerely remember Christ, as He said to us, as you partake:
19And he took bread, gave thanks and broke it, and gave it to them, saying,
“This is my body given for you; do this in remembrance of me.”
20In the same way, after the supper he took the cup, saying,
“This cup is the new covenant in my blood, which is poured out for you."
Luke 22 NIV
As we read also we must remember sincerely, in 1rst Corinthians chapter 11:
The Lord Jesus, on the night he was betrayed, took bread,
24and when he had given thanks, he broke it and said,
“This is my body, which is for you; do this in remembrance of me.” 25 In the same way, after supper he took the cup, saying,
“This cup is the new covenant in my blood; do this, whenever you drink it, in remembrance of me.”
Sincere focus on remembering Christ, and how He gave up His body for us, is the key aspect we must do. That this must be sincere and also done in fellowship when we are together is illustrated in 1 Corinthians 11 NIV
One good way to prepare yourself is to pray the Lord's prayer first. Also, it is helpful to recite His words, as the bread and wine/grape is offered: "This is my body, given for you. Do this in remembrance of me." "This is the new covenant in my blood, poured out for you. Do this, when you drink it, in remembrance of me.”"