I've done it multiple times for bench, as well as having done regular smolov for squats. Smolov Jr. for bench is a TON easier. You definitely don't need any other pressing work, but feel free to continue working lower body as normal, and definitely add a pulling motion in there to offset all that pressing. Personally, every time I've done it I've supersetted the bench sets with identical sets of weighted chins, and I've had good results for both. Just make extra sure you're doing lots of proper pre-hab, recovery and mobility work for your shoulders to avoid injury. Don't slack on this.