I believe that the first time that I said selichot I was at 770 Eastern Parkway on a Saturday night with "the Rebbe". Someone gave me the selichot booklet with old yellowed pages. I could not follow what was going on. At the end the Chasidim started singing something, I think it was some of the Aramaic that we say at the end of the selichot. I understood nothing, and I couldn't even hum along with them since I did not know the tune. I had this embarrassed kind of feeling that one gets when you are the only one in the room that does not know what is going on. But this wasn't a normal room. This was 770, with hundreds of black-frocked Chasidim singing and dancing while poor Cosmic X stared confused. (That weird, embarrassed and confused feeling was my lot quite often during the first year of Teshuvah.)
The rest of the selichot that year were not any better. It meant waking up earlier than usual to pray in the local synagogue. These guys had been saying the selichot since they were little kids, and they knew how to finish them off with blinding speed. (I'm not sure how many of them understood what they were saying.) All this was of course was a prelude to the Shacharit Indianapolis 500, which would be over in 25-30 minutes.
Later on when I moved to Israel my Hebrew vocabulary expanded, and my understanding of the selichot improved accordingly. The more I learned Torah, the more I understood what the authors of the Piyutim were alluding to. The composers of the selichot were great rabbis, who knew how to weave their incredible knowledge of Torah, Talmud, Midrashim and the Hebrew language into amazingly creative poetry. I also purchased an excellent book a few years ago that explains all of the selichot in depth, and I've really come to appreciate them. They are a true delicacy!
The bottom line of this post is that you get out of the selichot what you put into them. Take the time to learn the selichot, and find a minyan that prays at a speed that you feel comfortable with. If you are a beginner, don't get discouraged. Selichot can and should be a meaningful experience.