The skills that make you good at picking up your third+ natural language should be similar to the skills that make you good at picking up your third+ programming language. (With extra programming languages being much easier to pick up than extra natural languages, in my experience)
The guy might struggle with picking up programming to begin with though, it is indeed a completely different thing from human language.
The guy might struggle with picking up programming to begin with though, it is indeed a completely different thing from human language.