Ahh, I was really nervous about the observational drawings! I never really stopped being nervous until after I had gotten accepted haha
I had never worked with non-digital mediums before, nor had I taken any real art classes or had a chance to learn how to draw from life. I made my observational drawings my top priority for a good 4 months and I made a schedule with weekly goals. I’d try to do a still life at least once a week, I’d sit down and do a rendered drawing of a friend about every two weeks, I’d do some hand studies/gesture drawings every few days, etc. By the end of the 4 months, I had a large enough pool of drawings I could pull from for my portfolio, and I had grown SIGNIFICANTLY while doing so.
I still practice that kind of schedule even now; it’s a really good way to stay motivated and keep improving even when I feel ‘too busy’ from school to do much personal art.
Hopefully this helps though! Just jumping into things is honestly one of the best ways you can get over your insecurities with art.