Proverbs 3:5-6 Trust in the Lord with all your heart, and lean not unto your own understanding. In all your ways acknowledge Him, and he will direct your paths. Do not be wise in your eyes; fear the Lord and shun evil.
The Bible is full of examples of what it means to trust in the Lord with all your heart.
Noah building a great big boat in the middle of dry land when there was not a cloud in the sky, despite all the ridicule of all those around him, just because God said so.
Abraham packing up everything and leaving his home land when he was eighty years old, because God told him to.
Peter got of the boat and walk on a stormy sea just because Jesus ask him to. (remember he only began to sink when he took his eyes off Jesus.)
Whatever life may bring your way – Whatever God ask you to do. Be assured you can trust Him to see you through.
Some trust in chariots and some in horses, But we will remember and trust in the name of the Lord our God. Psalms 20:7