Are these really hard to make?

I wanna make this for my sons party I asked my sister in law I had these mind I think they’re so cute and I’m was one of many desserts I wanted to make. She instantly said “those are so hard to make” “I made them once and you have to have the constancy right” “this and that” 🙄 I told her either way IM BUYING THE MOLDS. I’m no baker at all and I’ve seen ideas and help online. But I just hate how you can never share happy thoughts without others being so negative about it. I know how she is already too can’t never say anything cause she always has something negative to say. But whatever I’m still buying the molds and making the effort to make them. Well see how they come out . Of course they’re going to be very simple