What program do you use? The mixing isn't too hard, the problem usually is mastering, a simpel master is to put a compressor on the master track and just leave it be, don't use a limiter tho. Just try to leave the Kick and Snare on the same volume level when they're togheter. and yeah, reese basses takes time, they have many many layers and they can be done in so many ways, I can't make them, I can't be botherd tbh.