Perhaps the simplest manner of pressing flowers is what many of us did as a child...
1. Use flowers that are dry and free of debris and insects. Remove unwanted parts of the plant, potentially stem and leaves.
2. Flatten out your flowers. Buds are harder to press than radial blooms. Petals may be removed from their thick core and repositioned on the paper to reflect their natural state.
3. Find a thick book. Because this is magical work you may wish to utilize a sacred book, such as the Bible or other grimoire. There is potential for moisture from the petals to crinkle or discolor your book, so you may wish to dedicate a book solely for the purpose of flower pressing.
4. Place your flowers between two sheets of paper, and place these within the book. Leave space between each flower or else they will stick together.
5. Close the book and wait. If the book is heavy enough then you may not need to weight it, otherwise you may need to place something heavy upon it or hold it tight with a belt or other type of strap. Similarly, you can use the technique below and no book is required.