First rule, don't be disheartened. You will walk into a charity shop and spy a mountain of vinyl and pound signs will pirouette before your eyes. Nonchalantly you'll wander over and study the first record. It'll most likely be a James Last LP or Paul Young's No Parlez. If it is a Matt Bianco 12" think yourself blessed. It's not worth anything but it's more encouraging than being confronted by Mrs Mills's chubby cheeks. I once found Matt Bianco singles in at least five charity shops on the same day. They were all different. I had no idea Matt Bianco had been so prolific; I had no idea a record company could be so tolerant.
As you begin to forage there will be gasps of recognition as the musical carnage of the 80's is offered up for your inspection. If you're lucky some lesser lights of the 70's or 90's may appear. If you're really lucky you might find one indie record. It won't be worth anything and you won't want it but it'll be a talking point when you describe the day to your friends. Under the influence of despair you'll even start rummaging through cassettes. Unless you find something by Judith Durham say no to tapes. This is the real life of the scavenger. If you can't cut it, leave it to those who can.