Problem with strumming patterns

Hi Guys,

I am a beginner. Its been a month I am playing an acoustic guitar, I can play couple of songs and trying to learn more. I have two questions about the strumming actually! Lets say DDU DUDU. Now when I strum, my hand is not in steady motion during the strumming part, I can hear that I play chords pretty good but my hand is stopping and moving (NOT Steady). I have read on internet and have watched many videos, most of them says you have to keep your hand moving steady even when you miss a stroke. I tried to play this way but I am finding it difficult this way, and I am not able to play songs better by steady motion of my hand.

Another question is for the strumming pattern of specific songs. I am trying to learn a song these days which have DUU DUU D this strumming pattern. I tried to play exactly this pattern and its difficult to play it faster, I think I may need more practice. But I tried to strum it in my way while playing the song on the computer, it sounded better! So what would you suggest? Should I practice the specific pattern or should I just keep practicing my own strumming pattern and would it be better with time ?

Answers and suggestions would be highly appreciated.

Thanks