If so, what are some tactics I can use to convince the seller to lower his asking price and win him over?

Your tactic is BAD either way and could get you sued especially if the seller can prove you had no intention of closing as the buyer and you try to back out. 

Either do it yourself (my tactic) or just assume it won't get done.

Just curious.....can't imagine any tactic....FSBO?

Before being exposed to marketing and sales I sometimes felt like I didn't like the 'tactics'.

I mostly need guidance on deals and tactics as my current tactics are pretty barbaric, I can power through any bad deal with my income from my full time job.I hope I introduced myself properly, I am open to any and all suggestions.Thanks,

In negotiations, if you can gain inside information of the opposition it can put you in a great tactical advantage... assuming you've studied negotiations enough to know how to exploit it. 

I have to negotiate with the previous  owner using lot of tactics to get the appraisal.

Brent, my-worth-what-you-pay-for-it tactical advice would likely be similar to Thomas S. actually :  stress test the various loans under different interest rate scenarios since we have a rising rate environment.

Any turnkey company (or really any company) that tries to sell you on the idea that they're doing you a favor, losing money, by 'letting you' get such a great deal, is lying - that's a used car salesman tactic and huge red flag.