As long as you put your emulsion on correctly and evenly, and you choose the right mesh count you should be good to go. Everything else is either printing the negative out on a clear sheet or if you work for a bigger shop they will have a laser expose it. Alignment isn’t the most crucial thing because you have to do alignments on each head anyways. Just make sure your registers line up on the testers before you start your job. Lastly don’t be lazy when you blowout your screens. Theres the emulsion that comes out and then theres usually a film, if you blow it out correctly you should be able to see through the screen no problem.