Stretch & Pull SD

2 ND question..., I've done my 2nd stretch & pull. The dough seems "tough/thick" & difficult to stretch already! I'm lifting it up trying to stretch it! I have 5 more to go! What am I doing wrong? I can imagine how hard it's going to get?I've weighed everything correctly. I dispersed very well. I mixed the salt with the warm water b4 adding & mixing well. I'm not sure where I