WARNING: propolis will stain everything it touches, so protect your work surfaces.
The first step is to grind up the propolis chunks.
If using chunks of propolis, grind them into small pieces with a coffee grinder. Propolis will stain everything it touches so consider buying one from a thrift store for the purpose of grinding up this and other plant material for tincture making! You can make the grinding process easier by freezing the propolis in a plastic baggie for a day or so prior to grinding it.
Place the propolis in a glass jar and cover it with alcohol. You want to make sure everything is completely covered by alcohol. Use 1 part propolis to 4 parts high-proof alcohol (for example 100g raw propolis to 400 ml 80-proof alochol).
Add a lid and shake the jar. Set it in a warm dark place. I like to set mine on our hot water, non-electric radiators. You could set yours near a wood stove (not on top - that would be too hot) or in another warm place in your home.
Aim to shake the jar gently every day or so.
Leave it sit for 6-8 weeks to make a high concentration propolis tincture.
Strain off the slurry of propolis using a paper coffee filter or cheesecloth into a dark glass bottle. I like to do a few strains to make sure the resinous materials are removed from the tincture.
Store the resulting clear dark fluid (which is the tincture) in a cool, dry place away from direct sunlight.