To the very wise words of MarkosC above, I would add: you also need to learn (over time) the inner workings of your chant system.
There is not just one “Tone 1” melody; Tone 1 is a family of melodies for use with troparia, stichera, prokeimena - generally, a different melody for each “class” of texts.
In the Slavic chant tradition, there is a different melody for every single irmos, made up of a stock of melodic phrases associated with each tone, but fitted (long ago) to the text of each irmos. Generally, speaking, you need to either learn the music for the irmos, or else use whatever substitute your chant tradition provides. (For example, in the Rusyn prostopinoije tradition, you would sing it to the melody of the irmos for the first ode of the Resurrection Canon in Tone 6, which is dead easy.) You would not otherwise sing it as if it were, say, a Tone 6 troparion.
Here is a pointer to the prostopinije version of the same irmos:
metropolitancantorinstitute.org/books/DL/page?280
and on the previous page is the “simple” version of the same melody:
metropolitancantorinstitute.org/books/DL/page?279