I mean thats the only part of the job thats meant to be difficult, finding places to cast your motifs and deciding when to hold it and making sure theyre all up for burst. Its filler is really easy its literally auto combo.
Its like how RDM has a melee combo to activate its big damage, it doesn't really flow well as a traditional caster but for RDM it adds flavour to a very simple filler of magic having you think about your positioning to get close enough to do your melee combo.