Yes, it is possible to test it first, and that is the better way to handle a large contact file.
For this task, WholeClear Split vCard Software can be used as a practical Windows-based option. It provides a free demo version that allows users to split 25 contacts from a VCF file. This helps check the output before processing the complete contact list.
After testing, open a few split VCF files and compare them with the original contacts. Check phone numbers, email addresses, profile images, company details, URLs and notes. If these details look correct. Then the licensed version can be used for unlimited contacts.
It also supports vCard 2.1, 3.0 and 4.0 so it works well with files exported from different apps and platforms. A safe tip is to keep the original VCF file in a separate backup folder before starting the split process.