@Francisco Feliz yes you can totally do it yourself but I recommend spending a little extra to ensure its all done correctly and you can get support at any time from them.

You must take risks, but, ensure that they are calculated risks.Below are some links to get you started. http://www.biggerpockets.com/startherehttp://www.biggerpockets.com/meethttps://www.biggerpockets.com/alertsHow to Use @Mentions on BiggerPocketshttps://www.biggerpockets.com/rules https://www.biggerpockets.com/termshttps://www.biggerpockets.com/inviteshttps://www.biggerpockets.com/perkshttps://www.biggerpockets.com/forums/categorieshttps://www.biggerpockets.com/rei/glossary/https://www.biggerpockets.com/webinarhttps://www.biggerpockets.com/courses/a-beginners-introduction-to-real-estate-investing (video courses)https://www.biggerpockets.com/real-estate-investing (Ultimate beginner's guide to REI)REI books suggested by BPershttps://www.biggerpockets.com/renewsblog/2015/11/13/7-real-estate-books-beginner-investors/ (7 absolute must read books for beginner REIs)http://www.biggerpockets.com/renewsblog/2013/04/14/best-real-estate-books/?

I'm the builder, so that's not an issue...the plumbing contractor will be happy to come back, but I want to ensure that I have a reasonable idea of the issue first (since it's not easy to reproduce).A couple things to point, since it sounds like it could impact your analysis above (or maybe not):- It only happens in one sink, which sits between two other fixtures (another sink and a tub). 

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The policy mostly to prevent straw buyers (an investor using your name and credit to buy a property, and his down payment), but also to ensure the investor has skin in the game.

I'd compare/contract all other financial options before committing & ensure you've considered everything in the financials including vacancies.  

Do check your local laws as they may be different than mine here,now ever, owners have the right and responsibility to inspect their properties and ensure the property is safe, has the required smoke detectors and carbonmonixide detectors, etc.

What is the recommended percentage you should put down to be conservative, not over extend yourself, ensuring good probability of no financing hiccups?

On my last refi, the bank told the AMC to get the appraiser to ensure we pulled permits.