There are a good many of us who trade “Part-time” in that we take longer positions and only look at the charts to see how we’re doing when a trade is in progress.
You trade a timeframe which is suitable for this approach and can easily enter trades using “Pending orders” which enter at specific price values. As long as you also set Stop losses and Take profit levels, which are also “Pending orders” by definition, that will do fine.
Try it out on demo. As long as your analysis is valid, it will work as well or better than “sweating over a screen” every second of teh day.
“Which pair” ? whatever pair you feel comfortable with. positioning of the pending orders is the most important part of this approach.