Now it’s up to you, not me. If you can live for 100 or 200 years you can do the preliminaries of all four traditions. [Rinpoche smiled.]
As long as you are taking refuge in the guru, Buddha, Dharma, and Sangha, it is OK. The path to enlightenment is the same in all traditions, without the root it is not possible. In regards to the three principles of the path, it is the same in all four traditions, but some have a little difference in presentation. However, it is very important in daily life to pray to have realizations and complete the path.
As far as the preliminaries go, do whatever you can, but remember preliminaries are not just to be done one time, and then not again. Even eighth and tenth-level bodhisattvas, who have vast amounts of qualities, continue with the preliminaries, performing them with countless manifest bodies. Even one so close to enlightenment is still performing preliminaries. You need to create merit and do purification to achieve enlightenment.
With much love and prayers...