Couple of tips.
1. Lacrosse ball is great but is at the more advanced end of trigger point scale. If you are new to trigger pointing, start with tools that are broader and softer like a foam roller. Also use less pressure. Progression of tools: Foam Roller - Tiger Tail stick - Tennis Ball - Lacrosse Ball - golf ball. Each one allows your to narrow in on tight areas better, getting deeper in the tissue but is also very painful if you aren't used to it.
2. Avoid rolling your lumbar spine. Lack of protective structures in the area may cause the muscles to contract when rolled in a protective response - not what you want when trying to 'release' an area. Focus on Glutes and hip flexor trigger pointing to alleviate lower back pain. Also use variations of a Supine Twist to stretch the lower back area.
3. Stop rolling your ITB thinking you will 'release' it and alleviate risk of ITB syndrome (
https://theendurecollective.wordpress.com/2014/08/08/tight-and-painful-itbs-get-off-the-foam-roller/). The ITB is thick, fibrous connective tissue - it ain't going to 'release'. If you have ITB syndrome or want to avoid it, stretch/release your Glute Max and TFL which connect to form your ITB. Release the tension in these muscles to release tension in your ITB. Longer term, strengthen your Glute Med and your general hip posture through proper strength training.
4. Use the lacrosse ball on the glutes by standing up, placing the ball between the glutes and the wall and then leaning into the ball. You can adjust the pressure much more easily before progressing to laying on the ball and then even crossing your leg while seated on the ball (agonising but great to get into the piriformis). Use the pigeon stretch in between trigger pointing to lengthen/stretch the muscles.
5. Pain isn't the aim of the game but some soreness initially could be expected. When trigger pointing, try and keep the pain level to a 7 or 8 out of 10. Anymore will cause a protective tensing of the muscles and not a release. Expect improvements to take 2-3 weeks of regular work but never totally neglect your maintenance work.
6. Don't forget to breath. Long slow breathing while stretching/trigger pointing will help the muscles relax.
7. Trigger pointing/rolling is to restore movement, tissue quality, blood flow etc. It's not going to fix the real problem. Eg. If you have ITB problems, chances are your TFL is tight and you may also be a very quad dominant person (very common in cyclists and sedentary workers), resulting in weak/under active glutes, weak 'abs' and overactive/tight lower back muscles. Trigger pointing and rolling the quads/hip flexors in order to restore range in hip extension is great, but without activating and strengthening the glutes and abs, you are going to fall back into tightness and continue to feel pain/tightness on the roller. Mobility work needs to be paired with strength work for long term fixes - this is why cyclists primarily need to be in the gym. It's not about bodybuilding or increasing power etc, it's about injury prevention through balancing/restoring proper muscular balance and function.