i have a collection of clips by which i wana make a movie...till the date i am using nero vision which is included in nero 9 for joining my clips into one single movie....i am facing problems in these fields

1.by mistake i have joined 2 similar clips twice n now i wana cut them out but cant be able to do so as i ma getting confused in the steps...plz guide me step wise how to do that

2.i have to make certain part of movie to play faster and certain have to slow and certain have to be normal and side by side i have to put some songs in background....how to do this

treat me as complete new bee and tell me step wise how to do that

if you have any other suggestion for the software which can do this easily than do tell me and ya i have shooted this movie with my mobile n 95's 5 mega pixcels cam which has resolution of 640X480 @ 25fps