In general, there's nothing wrong with taking on multiple skills at once, for example, practicing the C major scale, learning some new chords or songs, and learning a technique like hammer-on's or pull-offs.
What you want to avoid it moving on in a subject before adequately understanding & practicing the necessary fundamentals. So for instance, you don't want to get into sequencing or arpeggios for the C major scale if you're still making a lot of mistakes when you just try to play the scale in a single position.
Mastering the Cmaj scale is a great goal, and while it will take some time, its well worth it. There are 5 different positions for the C maj scale across the fretboard. Learn them one or two at a time, until you can play all 5 positions without making any mistakes. Remember, you're not going for speed here. You're teaching your fingers where the right notes are, so go as slow as you need to, to keep your accuracy high. Try jamming a little bit on your own or with a backing track to help the scales sink in. Once you feel you know all 5 positions try moving from one position to another without making mistakes. If you lose your bearings and need to pause your soloing a little, that's fine. Its much better to pause, figure out where you are on the fretboard than it is to guess and randomly hit right or wrong notes. Eventually, you will start to see all 5 patterns across the entire fretboard.
Don't forget to try out different keys too. When you feel pretty comfortable with all that, you can start looking at modes, which will open up your note choices and probably influence your chord choices as well. It takes time, but its worth it.