These are new words used in the dialogue. Try to memorize them.
1. 書き始(はじ)める [kakihajime-ru] to begin to write 2. 時間をかける take time [deliberately] 3. スイスイ with ease; swiftly 4. アイデア idea 5. 変(か)える [kae-ru; vt] to change (something) [かわる [kawar-u; vi] "(something) changes"] 6. 書き終(お)わった [kakiowar-u; past of かきおわる] finished writing 7. いやだということ the fact that I don't like it [Sということ "the fact that S"]
[kakihajime-ru] to begin to write
take time [deliberately]