You should first test yourself so you know exactly where you stand. Without testing yourself, all you have to draw from at this point is assumption that youre clean (and you know what they say about "assumptions").
When testing yourself, be sure to use the first urination of the day.

Its not all uncommon for daily users to still fail after dilution. Dilution techniques are far from being a 100% sure thing. They can backfire if the THCA concentration in the bladder is too high. For most longtime daily users, it would be virtually impossible to dilute that concentration enough without overdiluting and sending up the red flags at the lab.

I do have a good excuse for if they question the dilution, I am undergoing lipolaser procedures (this is true) that require me to drink 70 oz. of water a day. Do most employers accept these excuses and allow a re-take? How common is it for the employer to automatically fail you from dilution?
Youre asking the impossible because each employer is different. If I were an employer, I personally would not accept this as an excuse because drinking fluids in the days leading up to the test is of no help. The dilution phenomena is only temporary - once the fluids ingested had all been urinated out, the bladder is replenished with fresh THCA-laden urine and thus, the donor would resume testing positive for THC.

I do not have much of an interest in using the substitution method. Makes me too paranoid and if I failed from that I would feel like a huge idiot
You cannot fail if the person that youve obtained the sub sample from is indeed drug-free.