If you're interested in undergoing trigger point therapy, consult your physician for help in finding a qualified practitioner.
Sources:
David J. Alvarez, D.O., and Pamela G. Rockwell, D.O. "Trigger Points: Diagnosis and Management." Am Fam Physician. 2002 Feb 15;65(4):653-661.
Alonso-Blanco C, de-la-Llave-Rincón AI, Fernández-de-las-Peñas C. "Muscle trigger point therapy in tension-type headache." Expert Rev Neurother. 2012 Mar;12(3):315-22.
Craig LH, Svircev A, Haber M, Juncos JL. "Controlled pilot study of the effects of neuromuscular therapy in patients with Parkinson's disease." Mov Disord. 2006 Dec;21(12):2127-33.
Furlan AD, van Tulder MW, Cherkin DC, Tsukayama H, Lao L, Koes BW, Berman BM. "Acupuncture and dry-needling for low back pain." Cochrane Database Syst Rev. 2005 Jan 25;(1):CD001351.
Renan-Ordine R, Alburquerque-Sendín F, de Souza DP, Cleland JA, Fernández-de-Las-Peñas C. "Effectiveness of myofascial trigger point manual therapy combined with a self-stretching protocol for the management of plantar heel pain: a randomized controlled trial." J Orthop Sports Phys Ther. 2011 Feb;41(2):43-50.
Tough EA, White AR, Cummings TM, Richards SH, Campbell JL. "Acupuncture and dry needling in the management of myofascial trigger point pain: a systematic review and meta-analysis of randomised controlled trials." Eur J Pain. 2009 Jan;13(1):3-10.