Lower level post self-voting is just fine, with so few Steem Power any bit will help you grow your account and it will not be frowned upon in any way. This is more for the very large impactful accounts tied with spam, malicious self voting comments etc and very large accounts where a self vote is worth $500 and by voting for themselves can push there content directly to the top, may it be good content or not. The are many fine lines and many different opinions, make sure to read through the comments here and listen to what people are saying and come to your conclusion 😉 good healthy debate.