When you are confronted with challenges that are difficult to conquer or you have questions arise, the answers to which you do not know, hold fast to the things you do know. Hang on to your firmest foundation, however limited that may be, and from that position of strength face the unknown.
God never leaves us alone, never leaves us unaided in the challenges that we face.
A life without problems or limitations or challenges--life without "opposition in all things," as Lehi phrased it (2 Nephi 2:11)--would paradoxically but in very fact be less rewarding and less ennobling than one which confronts--even frequently confronts--difficulty and disappointment and sorrow.