Arnold loved the standing barbell curl for building baseball biceps. When looking for a major mass-building move, Arnold preferred exercises that allowed him to push heavy weight, let him achieve a full range of motion, and could be hammered for 6-8 heavy reps. That's how he built his biceps into mountains, and it's a great start for your workout, too.
Cons: We would recommend that in the case of an exercise such as the bench press, you have a spotter behind you just to be extra safe. Also, the reason we don't like to use this technique too often is that overusing it can create muscular imbalances. What we mean by this is that you get stronger in the top portion of a movement while your weak range of motion, the bottom portion of the movement, remains the same.

You can reduce frequency. This would definitely be my first choice. If you’re using the 4 day upper/lower split, just switch to the 3 day version. The slightly lowered frequency/extra day of rest between each workout should GREATLY improve any recovery related issues you may have. If you’re already using the 3 day version and it still seems like it’s too much for you, see below.
When lifting it is essential to focus your mind completely on the muscle group you are attempting to work on. This makes sure that you are actually using the target muscle to lift the weight rather than accessory muscles or even momentum. This skill will develop with time, and as you progress in making that mind to muscle connection, your workouts will become much more productive and efficient.