We will use a very simple method to collect and observe pollen.
What we need
You need a tape, a microscope and a glass slide.
Just open the flower, locate its anthers and use the sticky side of the tape to collect the pollens by touching the tape to the anther. Then paste the tape on a glass slide and observe it under a microscope.
If you collect flower of a plant whose name you don’t know you can use various mobile apps like Google lens, PictureThis or inatutist to identify the plant by showing the apps the picture of the plant/or leaves and certainly flowers.