I’ve been knitting lace for about 10 years and I can tell you that usually randomly decreasing in a pattern to get rid of excess stitches will often get you into more trouble later on. If you are sure that the main part of the pattern is lined up correctly and the extra stitches are truly at the edge then you could go ahead and decrease.
However, if the extra stitches are a result of putting in YOs in the patten where they don’t belong and you decrease at the edges you will be throwing the whole pattern off kilter.
With lace knitting it’s a good idea to get in the habit of counting stitches after each and every pattern row before going on to the next row. If your count is off, go back and find the mistake. You don’t necessarily have to tink back. If it is a YO where it shouldn’t be, put a marker on it and just drop it off the needle on the next row. If you missed a YO put a marker where it should have gone and lift the bar between the stitches on the next row to make an instant YO.
Some people like to put stitch markers between patten repeats across the row to help with the counting.