Hey gang! I am writing my very first fan letter, from the US and to a UK celeb. I've read through this thread but still have some questions. (I also figured it'd be better to bump this old thread than to create a new one.)
I've got my letter mostly written now. I don't have any photos or merch or anything--I'm just including an index card if they want to sign it or put a little note. And I'm guessing the two envelopes I use (one for my letter and the other the SAE) need to be different sizes, the SAE smaller to fit inside the original envelope? Or should I use the same size and just fold the SAE inside the original? What sizes should I use on both? Also, should I include my return address on both envelopes?
But it's postage that's causing me the greatest pain. I want the SAE to be stamped, but I was crushed to learn today that IRCs were discontinued by the USPS earlier this year. What the heck do I do?? You can't order from the Royal Mail website unless you're British (i.e. have a UK address, phone number, etc.). It doesn't look like there's anyone selling on this forum either; I made sure to check the selling/trading section. (I asked one user who said they're not doing it anymore, and another I haven't heard back from yet.) And even though I'm not really expecting a response, I don't want to lower my chances to 0% by not including any postage on the SAE at all.

Worse, I've been trying really hard to get this letter sent off no later than the end of this week or weekend! Any help?
My second concern is with the length of my letter. I'm already almost done writing it, but I only just read on this forum that length is a big no-no. Er, well... my letter is looking like at least three handwritten pages so far! xD However, this is a rather minor celebrity, so while I'm sure she gets her fair share of fan mail, I don't think it's as constant as the big names. So is the length still in danger of being too much? (I spent a lot of time talking about some of the celeb's more obscure works, so hopefully it will still be meaningful.) This celeb seems like a private person--they're not on Twitter or any social media--so I don't know if I should expect any sort of reply. But if the celeb never so much as reads it, I would be beside myself! (Well, not that I would ever know, but I don't want to write anything I know the other person would never read or just toss into the bin.) So I hope three or four pages for someone who doesn't get as much attention as other actors won't be too much?
Sorry for such a long rambling post, and sorry if I'm retreading old territory. I'm completely new at this and wanted to get all my questions out in one place--thanks in advance!