Let not your heart be troubled
Once you wrestle the clecos in, things become much easier. The match drilling, deburring and dimpling process makes things go together much easier. Don't fret the proseal process either. It is what it is, a gray sticky mess. Just get a few boxes of rubber or vinyl gloves, some old clothes, plenty of ventilation, and start slamming rivets. Take it in small bites (say 2 ribs per session) and allow plenty of time for cleanup. Before you know it, you will be finished and qualified to brag to others how you conquered the black death. As an alternative, you can use the method where you proseal, cleco and then come back two days later to rivet. Some people have reported good results with this smear now and rivet later scheme. For now, just marvel at how much your biceps have developed after getting those ribs to mate up with the tank skins.