Learn rhythm first!!
by Mike B.
When learning to read music don't try to manipulate the pitches and the rhythm at the same time. Learn the rhythm first. Single line rhythm is EASY to learn. Build the complexity until you can clap your hands to anything thrown at you. You will be surprised at how fast you can pick it up. Now reading will just require practicing the dexterity necessary to produce the pitch(es) and techniques particular to your instrument. Much less frustration.
Hope this helps! Practice hard and let me know if you have any questions!