Do a warm-up set with just your bodyweight. Find the foot positioning that feels right. Start with just the bar. I don't think you need to do just one set, but keep the rep range around 15-20 so that you keep the weight low and can get your form down. Your legs will be sore afterwards, this is normal. Once you get over 95 lbs with confidence, drop the rep range and treat it like any other exercise.
Word to the wise: It's typically a good idea to do a warm-up with ~50% of your working weight. When you start adding weight, this means just warm-up with the bar.