4leaf, with Pluto the changes can also happen inside of you, how you think about your role in this world, what you think about having a career, and maybe wanting to go deeper into these things, wanting to change your image maybe in order to get more public recognition or starting something totally new which requires deep inner changes (like you could be very conservative and in order to change, you should become a bit more daring). When no natal Pluto-MH aspect is found in your chart, and if no natal planets in the 10th house will be transited by Pluto, then it could be that there will be more inner than outer transformation.
A trine shows that the transformation (whatever it could be) will go smoothly and you could adapt gracefully to new circumstances, doing away with old notions or situations and making place for new input, action, lifestyle, public image.
Hope this helps.
Starlink