But then the concept of Resource Credits hit me hard. When trying to post I was presented with a message of transaction error, and I could not do anything active on Steemit for the rest of the day. I learned that Resource Credits is another stat to keep an eye on, and it limits the amount of action you can perform during a given time period. I am still not sure if my 17 percent will be enough to post this today, we shall see...

Yeah, you need Steem Power in order to have Resource Credits to make actions on the blockchain. I delegated you 50 SP since it seems you will have some good use for it. I'll keep it for you for a month so in that period you will have time to gather some of your own from post rewards. The most straightforward thing is to take your post payouts as 100% Steem Power so you don't have to exchange SBD's to Steem and then power up. Power up all your earnings and you'll eventually have enough of your own.

You can also just buy Steem from an exchange – or use Blocktrades if you have other crypto – right away which is not a bad move either with Steem being so cheap right now.

Now you're not limited to just a few comments on the blockchain :D

PS. From mobile apps, I prefer Partiko myself.