I am not technologically advanced at all, and I don't even have internet on my phone. I don't sell very much and I have a very basic printer. I always ship using Ebay Shipping - It makes life so easy! Not only is it only $1.64, but DC is free and it automatically updates the tracking and everything in the buyer's my Ebay page. I do it at night and take it with me when I go to work in the morning and drop it off at the post office on the way. You really should take advantage of this, it is quite simple to get used to because it is basically completely automated. You just print the label on normal paper and tape it to the front of a bubble mailer.
Also if they open a dispute for not getting an item it saves you the headache of having to find the DC slip then typing it all in. I am almost embarrassed how many dc slips I lost before I used PP shipping. If it shows delivered the case gets closed before you even knowing anything.