I find that most seeds sprout well without a heat mat, but for peppers especially I bought one last year and I’m really glad I have one now. I use it for all seeds that like it warm and my sourdough starter. No problems with germination that way anymore.

Op was referring to the square foot gardening method, you can read more about it and the book here: https://squarefootgardening.org/ There are tons of YouTube videos and blogs writing about it too, if you prefer that over a book

I’m done with my general plan, I have an idea of what I want. Now let’s see what will go wrong and where I have to adapt.

Snap peas and radish are almost ready to go outside, my peppers and tomatoes seedlings are starting to grow. I’m looking forward to the season!

You’re lucky, for our area last frosts can come up until the middle of may :/ but well, I get a longer winter break :)

I just pluck them out with a small spoon or a chopstick while they are still pretty small. It works well, I did this for some years already.

But if you wait too long the roots get bigger and tangled, so it’s a bit more effort because I usually transplant early into a small pot and then repot them later into a bigger pot. I try to save space while growing from seed because our last potential frost date is mid may and there’s not so much space on our south windowsills where I put all my seedlings. So it does get crowded with fennel, zucchini, peppers/chilis and the tomatoes.