Seminarians who are preparing for ordination often wonder about how to give their first priestly blessings, both after their ordination and First Masses, and in other situations where people approach them – usually during the first year especially (for which, incidentally, there is NO plenary indulgence, contrary to popular opinion).
The great Fr. Hunwicke offers a very fine suggestion in this regard. Here is the Latin version:
Per impositionem manuum mearum sacerdotalium et per intercessionem beatae Mariae semper Virginis, Sancti N. et omnium Sanctorum, omni benedictione caelesti atque terrestri benedicat te Omnipotens Deus, Pater, et Filius, et Spiritus Sanctus. Amen.