When I have a big hop load, I will clip the bag to a spoon to suspend it off the bottom of the kettle or use a stainless mesh hanging basket (utilization suffers a bit in my estimation); otherwise, I just dump hops in and swirl up in the chill down process using my Jaded immersion chiller as a big stirrer. Again, it depends on the amount of hops and whether I intend to reuse yeast from a hoppy pitch.