Same as with any system,The way i did it was i dug into their symbolism and history for Prepatory emmersion, and i used the mantras and of each god to connect with them with japa meditations after i opened my ritual circle. Had along of change happen in those years.
Most extreme invocation with shiva i did i ca. Remember was when i ended up in a japa cycle of 108 x 10. Helped me learn alot about myself and rid myself of alot of toxins in my life. Both within and without.
If you follow the basic principles you can work in any system from what my experiences have shown.