The quick background: 

I hate my current job. I mean, I HATE it. I am extremely overworked, underpaid, we are understaffed and management continues to not give a fuck. Luckily, I have performed very well and was promoted (although the pay is shit and still not competitive at all, but the title "looks good" - they did it to try and keep me around). My experience is now legitimately valuable to other companies. I am 24 years old so it definitely was not this way when I graduated college. I am making my move now. 

So, I just finished the interview process with Company A. It went very well and I will likely receive a pretty good offer soon - maybe even by tomorrow.

Insert Company B. A juggernaut company that I would really LOVE to join. The pay will likely be better, I will be able to live in a less expensive area, and I will not have to commute. I really want this job. However, my first phone interviews are tomorrow (when I will likely receive an offer from Company A). 

The last thing I want is to turn down Company A to go for Company B, have Company B not work out, and then wind up stuck at my current job. I really hate it, people. I have REALLY been wanting to quit for like 8 months now.

Is there a good way to manage this process? Should I be straight up with Company A and tell them I need a week or so to prospect another potential offer? [this just sounds like a terrible way to go about things in my opinion] Should I tell them I need longer to consider their offer? [feasibly I can only ask for 2-3 days, right???]. I really don't want to alienate A to make B try and work (when B is not really a sure thing). Is there a "good" way to go about this process?
user
I hate my job, so I am interviewing with two other potential companies this week.
assistant
The quick background: 

I hate my current job. I mean, I HATE it. I am extremely overworked, underpaid, we are understaffed and management continues to not give a fuck. Luckily, I have performed very well and was promoted (although the pay is shit and still not competitive at all, but the title "looks good" - they did it to try and keep me around). My experience is now legitimately valuable to other companies. I am 24 years old so it definitely was not this way when I graduated college. I am making my move now. 

So, I just finished the interview process with Company A. It went very well and I will likely receive a pretty good offer soon - maybe even by tomorrow.

Insert Company B. A juggernaut company that I would really LOVE to join. The pay will likely be better, I will be able to live in a less expensive area, and I will not have to commute. I really want this job. However, my first phone interviews are tomorrow (when I will likely receive an offer from Company A). 

The last thing I want is to turn down Company A to go for Company B, have Company B not work out, and then wind up stuck at my current job. I really hate it, people. I have REALLY been wanting to quit for like 8 months now.

Is there a good way to manage this process? Should I be straight up with Company A and tell them I need a week or so to prospect another potential offer? [this just sounds like a terrible way to go about things in my opinion] Should I tell them I need longer to consider their offer? [feasibly I can only ask for 2-3 days, right???]. I really don't want to alienate A to make B try and work (when B is not really a sure thing). Is there a "good" way to go about this process?
user
I want to move on to a better job, but it may be too late
assistant