1. Not majoring in computer science the first time I quit my physics major. If you like something, don't stay away from it for silly reasons (like thinking that school will make you un-like it).
2. Not knowing the difference between profitability and traction when I was looking at startups to work for. I spent 2 years at a relatively low-growth startup because I thought that its profits meant it was successful, when I could've learned much more at a higher-growth yet unprofitable startup.
3. Letting ideas sit too long. I had the idea for http://www.whatshallidonow.net/ about a week before I started implementing it, but was busy with job apps. In the meantime, http://nowdothis.com/ launched, and now they have all the momentum.
4. Spending too much time on super-ambitious projects and ignoring the low-hanging fruit.
they've got amazing simplicity, and done client-side so instant response (remembers you with cookies, but seems to be no server storage). But you have to do the tasks in strict order, and you have to finish it before moving on (you can't just "make progress").
whatshallidonow changes the order. it has a "made progress" button. it would be nice if it had a button "skip - I don't want to do this one right now!". (tho you can achieve that effect by reloading, ctrl-r).
That quote is not just encouraging, it's also literally true (unless your market is >50% saturated). Plus, no two products are ever identical (whatshallidonow is a slightly different idea), and no two users are either: some like yours. However, I agree there are benefits to being first, #1, etc (and it's more exciting).
2. Not knowing the difference between profitability and traction when I was looking at startups to work for. I spent 2 years at a relatively low-growth startup because I thought that its profits meant it was successful, when I could've learned much more at a higher-growth yet unprofitable startup.
3. Letting ideas sit too long. I had the idea for http://www.whatshallidonow.net/ about a week before I started implementing it, but was busy with job apps. In the meantime, http://nowdothis.com/ launched, and now they have all the momentum.
4. Spending too much time on super-ambitious projects and ignoring the low-hanging fruit.