When you are logged in, and you visit Pinterest, what you see in your feed will be Pins from those you follow. When you are not logged in, and you visit the site, what you see in the feed will be “random” Pins from users in general. As soon as you log in, these will disappear. So if you like something you see, try this:
Open the Pin in a new tab. (I like to right-click it, because I have “open in a new tab” in my right-click menu.) Do this for any Pins you see that you’re interested in. Then log in. Now you can refresh the pages you opened the Pins in, and you can do anything with them you would normally do logged in, without having “lost” them in the meantime.

Great tip! What is your policy on rewriting pin descriptions? Do you pin them as is, or rewrite, or add to it? I’ve been curious about the etiquette there, as a new user. I’ve generally only rewritten ones I am strongly interested in trying, or have tried.
Hi, Susannah!
It depends. Honestly, if I’m in a hurry, or pinning several things consecutively, I don’t always remember to rewrite anything. But if I remember, I look at the content of the description. If it’s pretty basic just…descriptive stuff (as opposed to someone’s opinion or personal notes), I usually leave it (‘though on occasion I’ll add to it).
If it’s personal stuff, I try to change it, usually.
If there’s a really good personal note, it seems to be a “thing” to just add a little note to the beginning like “Previous pinner says:” That way people know it’s not your words. So I’ve done that a few times.
It all depends on the pin, though. It is my understanding, statistically, that MOST people don’t change the pin descriptions.