You don't need to have done the 40 day program before doing rituals. However, it seems you mean magick rather than rituals.
Rituals are ceremonies you do to the Gods where you don't expect anything in your life to manifest, you only do them to connect with them. Magick is done to manifest some change in your life.
Everyone can do standard rituals or the dedication ritual or God rituals, but you need to be experienced in meditation to use magick. For the love spell specifically you also need to have experience in other magick as well as the mental maturity to know if you truly need it or not, because in 99% of the cases it's better to use a non-targeted Venus square to attract your perfect partner instead of a specific person.
Read my reply regarding this: