Being able to get the weight up on your own vs help with this.

[TrapsMcLats]

I would seriously doubt that even 5% of any BB'er does DB C&P's in a regular workout. Doing 3 to 4 sets, of 6-9 reps, in the DB cleans can go a long ways to adding size, thickness and power to the traps, biceps and delts. After awhile this can make setting up a pair of 120's + for overhead presses a piece of cake.. So hard for some to get the weight on the shoulders for presses because they only  do the clean to the shoulders for one rep, of one set per overhead DB press set. Practice the lift, in regular workout, to get good at it. You will be happy with the results. The cleans, with the overhead DB press, can get you to buying a larger shirt/jacket size before you know it. And,of course ,broader shoulders.

Can start with DB rack, bench, off the floor or even kneeling DB cleans to the shoulders. Use one arm at a time (as I mentioned before) , which seems to work best when standing. Works extremely good for me.Can also do DB Hi-pull as a aid to DB cleans. I usually favor one arm at a time, but two is good too.

Might do what Local Hero says, that's been the standard for years. Crouch, pull and you take a seat on the bench, all at the same motion. A good method that will require a little practice. Came to my attention, many years ago, that a lot of BB'er are not the most coordinated people in the world. They just have to train a bit harder to get the balance and timing down on a few movements.

A little hint; Use a lower height bench when doing C & DB presses. This also help's  greatly with DB flat or inclines bench presses. Another hint, try BB cleans & press for some impressive mass gains. Good Luck.

There are a number of  how to" vids on youtube of all the various exercises you mentioned, can you post a few that are decent examples? 

[jpm101]

Most any video should explain cleaning, it's a pretty basic function in lifting. Use any video you want.

As far as DB cleaning goes, make sure the knuckles are facing somewhat forward & the DB close to the leg(s). The wrist will twist as you pull the weight up, with perhaps a little knee dip. The ideas is to get under the DB and "catch" the weight on the shoulders. All providing that the DB is raised high enough to do all of this. Same idea with a regular BB clean. In either case, keep the DB/BB close to the body throughout the pull.

DB bench/floor/knees/rack /power cleans follow the same plan. Only difference between the clean & Hi-pull is that you do not flip the DB/Bar onto the shoulders with the Hi-pull.

Hang cleans are started by holding the bar/DB crouched and about mid leg height or a little above the knee cap. Depending on the version that is being done. Any version of cleaning is done with dynamic and quick motion.

Cleans and Hi-pulls can build muscle mass, speed and timing. Football players always include some form of these two exercises in their training protocols. Depending how used, can also build an high degree of stamina (endurance + strength). Good Luck.