Cello beginner with anxiety about the road ahead

I'm a musical beginner who has done only the violin for about 6 months and is embarking on the Cello. What advice do you have for letting go of the anxiety about how difficult the instrument is, and how many things there are to learn in order to get beyond "beginner"? How many minutes a day do you practice? How do you keep the enjoyment factor up even though the early months are frustrating?