If you decide on letting a lawyer do this for you, take a lawyer that is not a local one (in the same municipality as the landowner or land), to prevent scams/bribes, and ask around for the lawyers' reputation first.
Quick answer : Prior to buying the property, get a copy of the title from the seller and then request for a certified true copy from the Register of Deeds. Compare those two documents. The most important part here is to check for liens and annotations.
Long answer: Part of your due diligence is to secure from Register of Deeds all the titles preceding the current owner’s title, all the way back to the OCT, or the original certificate of title. It may cost you, but it’s well worth it. This will tell you the history of the title and if there’s no gap in the trail of ownership. Having no gap strengthens the possibility that the land has no other claims to it.
Bring the tax declaration to the city/municipal Assessor, and then to the Treasurer’s Office if taxes have been paid - to date. Bring the title to the City/Provincial (for municipalities) Register of Deeds.
*To all passengers passing through Surigao City via land/sea: no requirements
*To all tourists from other provinces/region, going to Siargao Island via Macapagal Port Terminal, the requirements below shall be followed
*To all Surigao del Norte residents going to Siargao Island for leisure, same set of requirements for Walk-in and Invited tourists; (coordinate with the municipality of destination if it accepts Negative Antigen Test Result)