The act of attempting to conceal can feel as bondage to some, it's what you want to cast off when taking acid. But it depends on each one individually.
It's very hard to estimate whether your friend will be in able to set up constructive thoughts to do what has to be done. Dose, personal reaction, expectations, mindset, setting, emotional stability, phase of life etc. However, it might be very well possible to act ordinairy during the trip, but to me it always feels a bit as putting filters around the senses manually.
For a starter, controlling LSD at 100 ug, in a comfort zone, corresponds somewhat with a good dose of mary-jane and most people are suprised by the clear and gentle nature of acid. It's really pleasant to one's body. Starting at the 2nd plateau of the trip.
But keep in my mind the first time definitely falls into the category "Spiritual life change", even 50-75 ug might be sufficient to reach that level in an ignorant individual.
It's very interesting to trip around others unnoticed if you've been through inner self-examination with past experiences on LSD. Just interaction with people, looking in their eyes with a glance, noticing micro facial expressions etc. will stretch out parts of their character through very specific witnessed details. But, don't think you yourself can get away without seeing your own unique habits from another one's mental seat. Accepted imperfection is one of the greatest conditions for a sincere act of compassion.
But first, let him trip to drink the beauty of the perception we have gotten from mother nature.