Buddha only advice for this in the vow. Probably, an unsurpassed
loving kindness of not giving unduly tense to living beings
:D
According to Master Ou-I, for pureland rebirth, the fundamental is
built on faith and vow, while concentration is the level of
achievement for the rebirth in Pureland.
Your gradual method is perfectly in tune.
我作佛时，十方众生，闻我名号，至心信乐。所有善根，心心回向，愿生我国。乃至十念，若不生者，不取正觉。唯除五逆，诽谤正法。
When I become a Buddha, the living beings in the ten directions,
when they hear my Name, sincerely and happily have faith in my Name
and in every thought transfer all their good roots so as to be born
in my Land. If there are only ten such thoughts and if they are
unable to be born in my Land, I will not attain The Proper
Enlightenment. Excepting those who have committed the five evil
deeds and who have slandered The Proper Dharma.
十八 十念必生愿。
18 Vowing that living beings are certainly to obtain a rebirth
in his Land if they are able to be mindful of Him in 10 successive
thoughts