Good advice so far. Take it slowly and make it really part of you. DO NOT disrespect your parents in your process. Always approach them in a responsible and loving manner. If they want to do something which you believe or actually know to be wrong (desecrate Shabbos, eat something from an objectively questionable hechsher), then refrain from doing the same or from eating it, but don’t for example, start tearing around the kitchen, throwing food out. You have no idea how powerful YOUR influence can be on them, when they see that the child whom they love has made positive, meaningful changes spiritually, but is still their loving child. Some baalei teshuva develop an unbecoming arrogance about being more religiously observant than their parents, and if ends up causing an unintended chillul Hashem.
