Take with you words, and turn to the Lord: say unto him, Take away all iniquity, and receive us graciously: so will we render the calves of our lips. Hosea 14:2 (see the AMP version too)
"And these signs shall follow them that believe: In my name shall they cast out devils; they shall speak with new tongues ..." Mark 16:17
"For with stammering lips and another tongue will he speak to this people. To whom he said, This is the rest wherewith ye may cause the weary to rest; and this is the refreshing..." Isaiah 28:11, 12
The Holy Spirit is our paraclete (lawyer,counselor) and the Lord Jesus has paid the price for us to have the rights to this blessing.
We must let the Holy Spirit plead our case. The assurance of this gives us peace which removes worry.
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"Wherefore, brethren, covet to prophesy, and forbid not to speak with tongues." I Thessalonians 5:19