Your tone will have a lot to do with getting them right too, bring the gain down to no more than 7 on the dial and play off the neck picups when you start out. Also, the key to sweeping is in rolling the pressure from string to string with the fretting hand so that only the string you are picking rings out. Lots of different ways and patterns to sweep the same set of notes too, pick the one that suits you. The more you work them into your playing you will come to realise that each different pattern of the same arpeggio has a different tonal and rhythmic quality to it which can add a new dimension to your lead.