Best way to develop different meditation practices (simultaneously or not) I got introduced to Buddhist meditation through the practice of meta and the cultivation of the four bramaviharas. It was going well but I decided I needed the ability to separate my ego and my will. For this, I thought vipassana would be the right tool. After doing some readings, however, it became apparent that to properly do vipassana I would have to develop my concentration with samadhi. At this time I almost solely do samadhi concentration meditation.

I am a lay person and feel I don't have time to do the different meditation sessions per day, one each for meta, samadhi, and vipassana. Yet I see benefits in them all and would like to master all three. 

Do you have any guidelines on how to incorporate different styles of meditation into my practice? Is it best to stick with one for a while, then move on to another? Is it best to rotate on a daily basis? Is it best to do a combination of all three in one sitting? 

Also, the question can be repeated for meditating on the four bramaviharas. Is it best to do them one by one, all at once, or something else?
Ideally what you should be doing is a different kind of Ānāpānassati Meditation. What almost everyone will try to do is the "breath mediation” or “mindfulness of breathing”.  Very few of us know that Ānāpānasati is infinitely more deeper than just focusing on one’s breath.

In many suttās it is described as assāsa/passāsa, which conventionally means taking in / putting out of something, and particularly to breathing in / breathing out. My advice to you is to take “So satōva assāsati, satōva passāsati” to mean “He maintains his mind on dhamma (what is beneficial) that should be taken in (kusala or moral) and those that should be gotten rid of (akusala or immoral)”.

“Assa” is same as “āna”, and “passa” is the same as “āpāna”. When  “sati” is added for being mindful of that, it becomes ānāpānassati. So, from now on, what ever that you do, wherever that you go, from the time you wake up, and until the time that you go to bed, try to be selective in taking in “good things” and throwing away “things that are not beneficial”. That is where mindfulness comes in. That cannot be done with breath.

That means basically all the time! One just needs to be mindful of one’s actions, speech, and thoughts, and stop bad ones and cultivates good ones. 

Try to be like a “rukkhamūla”. “rukkha” is “tree” and “mūla” is the “root”; even though the top of a tree sways back and forth with the wind, the tree trunk close to the root is very stable. Thus take “rukkhamūla gatō vā” to mean getting to a stable mindset. Get into a calm and stable mindset that is devoid of greed, hate, and ignorance; keep a modest attitude without any sense of superiority; be forthright and honest, and keep the mind on the main object of cooling down the mind”. That can be done anywhere, a formal seated meditation is not needed, even though that could be helpful.