Exporting 20 separate clips from one edited premiere sequence

Another way if you do this a lot: nest each piece. Select the clips for one export, right click, Nest, give it the name you want the file to have. Then select all the nested sequences in the project panel and drag them into Media Encoder in one go. Each comes in as its own job named after the sequence. Saves setting in and out 20 times, and you can re-export any one of them later without hunting for it on the timeline.

Queue them all to Media Encoder rather than exporting one at a time. Put the playhead over the first clip and press X (Mark Clip), which sets in and out to that clip on the targeted track. Ctrl+M (Cmd+M on mac), set the range to Sequence In/Out, give it a filename, and hit Queue instead of Export. Move to the next clip and do the same. Once all 20 are queued, start the queue in Media Encoder and walk away. If a "clip" is really several edits, set in and out by hand with I and O instead of X.