Happy to help with your pruning questions. For the evergreens you can shorten the branches by at least one third now and remove anything else that is dead, diseased or damaged by following the branches to the source or trunk and sawing or clipping. Your lilacs can be pruned after blooming and you can saw off the largest and tallest trunks at the base to encourage the newer growth and you can shorten branches again by one third or less but you will never be able to keep these mature lilacs short. They really want to be trees. There is a dwarf lilac called "Miss Kim" that might be a better option if you mush have a shorter lilac. As for your cherry trees this is not the best time to prune as the sap is running and will drip but always remove any dead or diseased wood any time of the year. Winter or fall is a better time to prune your cherry trees. Keep growing, Marianne Binetti