Hand expression and breast massage are extremely helpful for lactating folks. Here are links to videos that could super-helpful for you!
If you need further help, reach out to Babies in Common's International Board Certified Lactation Consultant, Jeanette. Send a simple text to 617-686-0052 or email email@example.com. Or, go ahead and...
The video above is specifically about PRENATAL expression of colostrum/early milk.
See minute 2:55 for demonstration of exactly how to do the prenatal breast massage and hand expression of colostrum.