First possible investment ID'd - should I get a buyer's agent?

[Andy Ferguson]

I am narrowing down a list of potential 3-4 unit residential properties for my first investment.  I still have some work to do fleshing out exact expenses & rent research, so I'm not quite ready to make an offer - this is more a general question as I approach my first deal:

I don't have an agent selected yet for my team - should I deal directly with the seller's agent or is there some benefit to seeking out a buyer's agent to help present the offer even though I already found the properties? Other properties (non-investment) I have purchased for my business have all been directly buyer-seller or new build, so I don't have experience with agents.  But, I am confident in my negotiating skills and am planning to go in with an all-cash offer of about 65-70% asking price (these are publicly listed properties).  Is the offer (which some may consider low-ball, others not - topic for another discussion) more likely to make it in front of the seller if I have my own agent pushing it?  Or conversely, would seller's agent be more enthusiastic knowing he gets full commission?  Again, I'm asking in general, not for specific deal analysis - I'm sure that will follow!  Thanks in advance!