It takes a lot of work to memorise technical terminology.
In particular, English words related to politics are hard to learn.
専門 technical/specialised
用語 terminology/terms/vocabulary
覚える memorise
苦労する it takes a lot of work/it's a big effort/it's difficult
「特に政治関係の英単語には骨が折れます」というのは In particular, English words related to politics are hard to learn で表現できます。
参考になれば幸いです。