It is important to say the pesukim preceding each
selicha, as they were chosen b’ruach hakodesh and they form
the basis for the selicha which follows.
If a person cannot keep pace with the minyan with
which he is saying selichos, he should say the selichos at his
own pace, and join the minyan for the “13 middos”, and then
simply continue from where he left off. The minyan should also be
joined for shema koleinu and viduy.